Her I am again, with a extremely beginners question... I have tried and tried and I can't figure it out... I'm allmost ashamed to ask this because it sounds so easy... But...
I have drawn a hand on the zero frame... Later on I edited the hand because I wasn't happy with the looks... But when I was happy with it, I saw I had been drawing on the first frame, and not the zero frame... Well, I thought, I grab frame one and hold and release at frame zero... This doesn't work

And then I have another question about frames in the timeline... Sometimes I make frames by mistake and want to delete them... So I select the frame and hit delete, or try the delete button above the timeline... But then sometimes frames don't get deleted... Why is this? How can I delete them?
Thank you very much in advance!