To use T-Mobile Internet to change your network’s name (you might see this called a service set identifier or SSID) or its password, open the app and log in.

From there you'll be able to see your current Wi-Fis name and password. For your username, look for the SSID name or the Wi-Fi name, and you'll be able to change it.

Hiding your Wi-Fi network's name does have a significant usability drawback, also. Hidden networks aren't only undetectable by nearby third-party devices, but by yours as well.