Change Password and Name of Home Network

If you are using the t-mobile internet app, at the bottom there is a tab, middle of the bottom that says Network. Try that. It should show your networks. Select one to change or create a new one.

If using t-life app, scroll the Home page up to find "Home Internet" and your network name. Touch it to select. 

Then choose "My Wifi" at the top middle.

Select your network from the list.

It should now allow you to edit the name, etc.