how do I change the way my name is show on the dynamic stamp?

You need to disable the "Always use Log-in name for Author Name".

Create any comment.

Select the comment.

Use right mouse click to select "Prperties".

Change properties of the comment, especially the Author's Name and click "OK".

Select comment and use right mouse click to select "Set as Default".

Test by creating a new comment.

Try changing the Name value under Edit - Preferences - Identity.