Yeah it was a bit confusing for me at first as it asks you on top of the page if you want to sign in or sign up, if you try to sign in you need to enter server name and obviously I didn’t know that either… But then you can just select one of the servers from the feed and join there. It should be a separate step, sign in or sign up and see list of servers.

I’m enjoying Memmy for Lemmy on iphone:

https://apps.apple.com/gb/app/memmy-for-lemmy/id6450204299