The process is exactly the same as if you were purchasing an item: click on ‘continue to payment’ and follow the usual steps. Obviously you will not be asked to provide payment details in the end, and therefore you will not be charged for anything.
This is a soot sprite (or Susuwatari) from the movies Spirited Away and My Neighbor Totoro. These little guys work up very quickly and are so adorable.
Find more from this designer at: facebook.com/nicholesnerdyknots