Hey Gary,
Wikitree doesn't take up loads of DNA. WikiTree takes the information on what test you have taken, then, automatically populates to appropriate profiles based on DNA inheritance.
To have your DNA test information auto-populate you need to have your Privacy level set to:
Your Profile privacy level is set to Private, so your DNA test information is not being auto-populated.
This help page is a good place to start and I hope it helps.
Mags