YAY for 20lb off! That's a big deal!
Ok, to your question: How to delete a snack meal and add the alottment to one of the other meals?
I'm not sure if you're using a meal plan or not. I don't use the meal plan.
If you accidentally put in food where it doesn't go, then you can remove it and re-enter it onto the meal or snack it was intended for.
I don't worry too much where my food is on the tracker as long as it's there. Your totals will all be the same.
I could also suggest entering the things you eat most frequently under favorites or groupings so that they're easier to find and enter.
I hope some of this is helpful. You're doing great!