How to confirm username in push it! app. Can you change username in push it?

also here is push it app so uh you can just tap on your username when you're already logged in into the app and when you have access so currentizing this app is only available in united states and a few other countries and i don't even think that in all states of united states but anyway how if you got access then you can just confirm your username and then just tap save and there you have it after this you won't be able to change your username so just be extra careful uh even if you don't have access to push it up you can just still climb your username before if you climbed it good and then when you have access finally to the app then you can just reserve it so something like that