The first thing you will need is a piece of ribbon about 15 to 16 inches long. I tend to waste a bit of ribbon because I like extra to work the bow with. You can always save the scraps for something else.
Next you will loop over your thumb on your right hand the left side of the ribbon
Now you will switch hands and hold the loop with your thumb and pointer finger and hold the center with your middle finger.
With your right hand wrap the right side of the ribbon around the loop from the front around to the back, under and through and pull to tighten a bit but not too tight yet as you will want to adjust your bow alittle before you tighten the knot.
And viola!!! A pretty bow for your card!! Then you can make the loops as big or as small as you want and cut off the long ends.