Go to User Library and swipe left to delete

Go to your User Library and tap the user you want to edit.

You already can!

I can increase the number but in iOS, the max amount of users is 20 so I am reflecting that.

What number would you like it to be increased to?

You can only crop single photos at the moment. I will be improving this in v5.1

You can use the Browser account to edit IMDB pages already.

Edit the user in your User Library.

Stories are planned for v5.1.