Here are (graphical) steps to log in to the Grenadine Event Guide.
Note that it is not necessary to log in to use the app and view general event schedules. However, if you log in, your personal schedule will be synced between mobile apps, web, and the event organizer.
Steps are outlined for the Grenadine Event Guide for iPhone, however the steps are the same for Android (just with slightly different screen look & feel).