Stamp is an image that can be saved on your profile for quick retrieval during document approval:
How to add a stamp to your profile
1. Open your profile settings
2. Navigate to the 'Stamps' section, then press Upload
3. Use the Corners of the selector to crop the stamp appropriately
4. When you are satisfied with the selection, press [Crop]
5. Press [Save] to store your stamp
You are now ready to add stamps during document approvals.