trying to create an account

I am trying to create an account for my business wifi tower. And to be able to use T-life app because I am having a horrible time with my wifi tower and it buffering. It will not stop buffering and then after a bit it finally just quits working and we have to wait an hour or so then try it again. So I was trying to get the app to see how to troubleshoot it. When I try to create an account for the t-life app it tells me to enter the code that was sent to the number but there is no code. It keeps telling me to go to: tfb.t-mobile.com

But then when I do it won't let me create an account. I don't know how to create an account to use the app. And since I can't get the app, I can't troubleshoot and figure out why my wifi isn't working like it should.

Can anyone help me with all of this?!?