Just remove the film from the backing paper, it's taped on one end. Wind the paper back on the spool n you are good to go.
If you need some more backing paper, I'm sure everyone here can send you their garbage. I just did 5 rolls of film n still have the paper on the floor of my garage where I do my loading.
Measure the start arrow and mark the end of the roll the same so it'll start about the same place each time you load backwards or forwards.