At the moment the profile screen has only the one option. Within time I’m hoping that more will be added to this based on feedback from users and that other users will be able to see your profile (or at least part of it). If you use ChastiKey for solo play and have no intention of sharing or loading locks then this part of the app can be ignored.
At the moment no one can see your profile page and the only people that can see your username are those that have loaded a shared lock you’ve shared, and those that have shared a lock that you’ve loaded.
By default each username is set a generic username which will look like this: CKU457. You can change it from within the profile page to something else providing your desired username is free. Usernames must be between 4 and 15 characters long and can only contain letters and numbers.