I get the undo. But I didn't notice it until I'd already entered many things. Don't want to undo everything to get back to the period change, then try to remember it all to catch up.

I've just started using Iscore and I am using Coach Mode. We played a game with 2 periods tonight and somehow I must have mistakenly bumped the period button moving it from 2nd period to "F". How do I edit that back to "2" during the game?