P·R·O·T·O·G·E·N·E·S·I·S review for Drop Hint 2.0 SMS Email Postal

I just started using the app. I am trying to enable text messaging, and the requirement to enable it is to leave a review. The app seems fairly comprehensive and usable so far. There doesn't appear to be an easy option to edit the cap, or even a hard to find option. I would like to have control over the max amount I spend on this app. I have nothing more to say at this point.