The Member's Area lives on this website and is separate from the app.
To register, simply use any email address and create a password. Once you are logged in you shouldn't need to login again, but use something you will remember.
Once registered, it may take up to 24 hours (unlikely) to become active.
After logging in the first time, from the Login screen you can click "Already logged in?" to access the area.
Refer to The Welcome Guide for more details.