Take empty frames and put 3 rubber bands on each end of the frames. Use 1/8 inch or narrower bands so that the bees will bee able to cut them.
Cut the comb out of the super, note which way is up and maintain it, place it in the frame and slide the rubber bands to hold it in place.
Smoke your hands real well before you start. Slowly slide your hand onto the comb, the bees will move out of the way. Use a thin knife to cut the comb. Move the knife slowly and the bees will move out of the way.
The comb will bee very soft. Handle gently. If you need to wear gloves, use thin nylon gloves so that you can feel the comb.
If you wait until later it gets harder to do.
If it is attached to the top, have something available to hang the lid from while you cut the comb.
Just this week, I had to use the frame of a PVC chair to hang 12" long comb from an empty hive a swarm moved into.
If the comb is attached to the sides, slide the top a little and use a long knife to free it.