To set up Tenda AC 1200 wireless router, launch your internet browser and enter the IP address. Now, the login page will open up. Enter the login credentials and press enter. Go to the "Internet Connection Setup" option. Select the type of Internet connection and then click on OK. Now, you need to enter some information such as alternate DNS, default gateway, DNS server, etc. Now, a successful connection will be formed. This will complete the Tenda AC1200 setup process.