How to Login to your router with IP address 192.168.16.1
Before trying to access the admin panel of a wireless router set with a 192.168.16.1 IP, check whether this IP is the one written on the actual device as a default configuration. While doing that, you might want to lookup the default username and password that the vendor has provided and set. Those might or might not be still valid, but having them in advance would save you some time if you need to try logging it with them on a later stage of the process.
192.168.16.1 Login tutorial steps
After having successfully linked your network adapter (Ethernet or WiFi) to the local area network managed by the 192.168.16.1 router, is when you have to check if your device of choice has obtained automatically a DHCP provided configuration set consisting of at least a private LAN IP address for your client device, a default gateway, netmask (subnet or CIDR) with a format similar to the IP format (in most cases 255.255.255.0), the DNS server addresses - such as either the router IP itself or external publicly available DNS servers such as 22.214.171.124 or 126.96.36.199 or 188.8.131.52.
Next would be loading the web router management interface that you can open by entering 192.168.16.1 in the address bar of your commonly used web browser. Which would lead to you being shown the login page of your router web admin panel.
Using the username and password either from the plate on the bottom of your physical router device or provided by the ISP, you would be able to authenticate and upon clicking Enter or Submit, you would end up at the admin dashboard where various router settings can be modified.
192.168.16.1 vs Public IP Address
As mentioned above 192.168.16.1 is a private IP address, meaning it is only locally available for connections within a closed local network. And the other type of IP addresses logically is the public type. Those IPs are generally used on the Internet for connections out of your LAN. And your device even though having only a local IP address can access all external Internet public IP addresses via your router (serving as a middle-man for all the connections in and out of your computer and/or mobile phones or other devices using the Internet). That is precisely why most basic and home wireless routers have 1 private network IP address and one external network IP. And the Router's IP address that is of the external type is being used for as an identifier for all outbound traffic generated by the devices behind the router, in the local network.
Managing the WiFi Network of 192.168.16.1
By this point you should have full control of the capabilities and settings of your 192.168.16.1 wireless router (presuming it supports WiFi). Most Linksys, Netgear, Asus, TP-Link, Tenda, Xiaomi and other WiFi routers come with a default password set for the wireless connection usually enabled with the factory configuration. And having your router in the long-term set with the default WiFI password is considered insecure. That is why what you would want to do once you have logged in as admin at 192.168.16.1 to:
Look for the tab in the management panel named "Wireless" or "WiFi" or "Wireless Settings". There you would be able to modify the Wi-Fi password to one that is different from the default.
You can also change the SSID of 192.168.16.1 (WiFi Network name visible in the available wireless networks list on client devices). It is a good practice to have that name changed to something recognizable so that you can easily share the details of your WiFi network with your friends and family.
Another important part of the wireless network router configuration is (especially if it supports dual or triple band) to enable or disable 2.4Ghz, 5Ghz or other frequencies used as separate WiFi networks. Bare in mind that 2.4Ghz and 5Ghz have different maximum wireless speeds, respectively 5Ghz offers up to 1Gbit/sec but since the frequency is higher, and if you need connectivity at a long distance, you might want to consider connecting to the 2.4 one.
Resetting a router with IP 192.168.16.1 to factory settings
There are two ways to reset your 192.168.16.1 wireless router to its factory preset default settings:
In the actual admin management panel, a tab named System or Factory Defaults would lead you to a button that would reset all the settings to the initially set by the vendor ones.
If you for any reason do not have admin access to the web interface of your 192.168.16.1 router, then the only option is to look for a tiny button on the device of the router which should be held pressed (usually with the help of a pencil) for a time interval of 10 to 15 seconds. That action will trigger the reset procedure which takes about 60 seconds, and leads to the device being restarted and reverted to its original configuration - IP settings, details, network names and such.