After activation that's it. You don't need to do anything or launch the App ever again, it works completely in the background. An unobtrusive notification is posted just to let you know your SMS has been archived when one is received.

The activation automatically links the app to your existing Treasuremytext account or even creates one for you. No passwords, logins, create account forms needed.

First screen after installing the Treasuremytext for Android app. Notice only one button in the entire app!