The default stamp and postmark on all envelopes is free, but you can change your stamp or postmark by viewing the front of the envelope on the Customize page and clicking on either the elements. The additional premium options will appear in the left menu with an option to toggle between stamp and postmark options. Click on the design you want to use, and it will appear on the Envelope.
Want to upload your image as a stamp? Reach out to us for help!