"I tried to draw a freehand line around a figure in a photo and could not then see a way to copy that elsewhere. Worse, I was unable to see a way to remove that line and it had transferred itself to the original photo and I could not get rid of it."
It sounds like you've drawing your line with a brush instead of the selection tool. Click the little arrow at the bottom of the "Select" button and choose "Free-form Selection". When you complete your selection, take your finger off the mouse button and the cursor should change to a four-headed arrow. Left-click again and you should be able to drag the selection to anywhere you want.