To make a Christmas tree bow, you will need ribbon, scissors, and a hot glue gun. First, cut a length of ribbon that is about two feet long. Then, fold the ribbon in half so that the two ends meet. Next, use the hot glue gun to attach the ends of the ribbon together, creating a loop. Finally, use the remaining ribbon to tie the loop in place, creating a bow. You can adjust the size of the bow by making it tighter or looser, depending on your preferences.