Set the Default Stamps
How do I set the two default stamps?
The first two stamps on the Stamps toolbar are place holders for stamps that are used often. They can be changed at any time to suit your needs for commenting.
Procedure:
To set the default stamps right-click on one of the stamps and select from the visible stamps list. That stamp will now be available with one-click until you change the default setting for this stamp.
Click the link for more information on How to Work with Stamps.