Finished cuff is 7.25 inches /Simply add more or subtract "Cast On" stitches in order to make this fit your wrist size.
Triple Crochet 4 into next dc
At this point there are any number of ways to finish your cuff.
Complete the row then tie off end and use the little tail to tie down a few rows to make a button hole. (optional)
You can add ribbon by weaving through the bigger loops--bring the ribbon through the 'button hole' and lace it through the two ends to bring them together (as above):