Sandy, you have already added your Gedmatch ID. Are you still needing help or is this something different?
For other, on your profile page where it says DNA Tested, you can click on the link that takes you to the DNA tests page for your profile.
You can then click on Edit or Enter more details.
Look for the box that says GEDMATCH ID and enter it.
Do the same for Profiles you manage from the profile in question. Thus I added my parents GEDMATCH ID's and DNA tests from their profile page.