potty training help?

Hey everyone...

Just wanted to say thanks for all the advice that you community members have already given me...and I have another question!

I'm trying to potty train my two girls, but it seems they're just not getting the hang of it. I've gotten them a separate potty tray with litter, and put it in the corner of the cage where they've (previously) been most often pooping. I've put their poops in it to give them the idea that this is where they're supposed to go. However, they apparently just decided to switch pooping places....XD

Then tonight, one of them pooped on me for no apparent reason, which she's never done before. She wasn't exhibiting any signs of stress or squirming, just decided to go. When I was cleaning everything in preparation for the new litter box, I noticed that my older girl (pretty sure it's her, anyway) has apparently also been pooping in the food dish, which I thought was pretty weird. Neither of them seems sick in any way, though...

Any tips??

Again, many thanks!