Note: My design will fit perfectly into any postage size. Just follow the instructions below if you have problems.
Step 1 - click on the "Customize it" button.
Step 2 - click on "Custom Stamps Option" tab. Choose a size. You will see the design fitting nicely to the stamp size of your choice.
Step 3 - click on the "Customize it" tab again if you wish to personalize it further.
Step 4 - add to cart and you are done!