I posted this on another DNA question, but give this a shot:
I've not done DNA testing, so this might be a bit beyond my capabilities, but from what I've read, you should be able to:
Go to your own profile, click the pulldown menu for My WikiTree and click on DNA Confirmation
If you've got a test registered, it should show here - if not...
In that page, go to your section and click on DNA Tests
Where it says "Add A New Test", use the pulldown to select which test you took, add any comments, and click the big Add Test button.
I think that should add the new results to your profile, if I understand it correctly.