How do I undo in Dorico for iPad? (I hope it's simple)

I am a beginner and making mistakes I need to undo but I can’t find any udo

The Undo button is the little hooked arrow pointing to the left, next to the metronome at the top of the screen. Redo is next to Undo. Welcome to the forum!

Ah, brilliant. Thank you very much. May I also ask how does one delete a project? I’ve created a few that went astray and would like to get rid of them but haven’t found how to do that. Thank you very much for the welcome! I’m probably going to be here a lot. Just starting to transcribe. I’m taking jazz guitar lessons with Greg Skaff in New York, by zoom. We’re working on So What.

Thanks again.
Jim