How to pair a new remote to mecool km6

My dog destroyed my remote to my km6. Going to order another one, but how do I pair it with the km6 without being able to get into any settings on the mecool. Also in the mean time I have a spare remote to a km3 and was wondering if I could use that on the km6 and how would I do that. Please simple directions if possible.

easiest way is remote with a usb dongle