Hi Niki! You can absolutely still become an iPhone tester here. The app is still under development (although it’s close and the iPad app should be launching soon, followed by iPhone a few weeks later).
The functionality will eventually match the website, but to start with we’re including core functionality such as Basic Edits, some Effects, Touch-Up tools, Frames and Pro tools. We’ll then add Collage in a version shortly after as well as Stickers, Text, and more effects etc.
Let me know if you have any other questions!