To log in to the app, tap on the hamburger menu on the right side and then tap on "Log In". If you haven't done so already, create an account by pressing the "Create a Grace Space App Account Now!" button. Here you can enter your email address and a password of your choice. Alternatively, you can register using your Facebook or Twitter account. This login will be separate to your Inner Circle or Inner Circle Elite login.
The app will remember your login details so that you don't need to type them in each time.