Hi, within the gallery app you should have the function to long press on an image and select move. I always find it easier to connect to a computer and move images that way first.
"Albums" are folders. Just move (copy and delete if you want to make sure - a trashed move leaves you neither file, a trashed copy/delete leaves you at lest the original) the file from the folder it's in to the one you want it to be in.