Hi David, I took a quick peek at your profile. I see you have added the AncestryDNA information but there is nothing entered for GEDmatch.
Go to the "Add" dropdown at the top right of your WikiTree profile, select "DNA Test Information" from the dropdown and choose "edit" for your current AncestryDNA test info. There will be a box for you to add your GEDmatch ID.
For people in your family tree that also have GEDmatch uploads, you will be able to "compare" your results in GEDmatch. WikiTree doesn't automatically compare DNA.
Hope this helps!
Shanna