In short, no.
Slatable isn't a cloud-based app so there are no signups or logins.
When you first open the app you are asked for your personal contact information and representation information. This is purely for your title cards. If you subscribe to AuditionDrop it will also be used to share your Audition.
Slatable is not a cloud-based app which means all content you create is stored on your device. If your device crashes or you buy a new device you'll need to backup your Takes and Auditions, either to the Photos app or backup your phone with iTunes.