You don't actually upload your raw DNA to WikiTree. You will, however, want to add your test information on your profile.
On your profile, click on the 'Family Tree & Tools' tab. Down in the WikiTree Tools section should be a line that says 'DNA Tests for Sandra Cassel.' Scroll down a little to the 'Add A New Test' section, and add in your information. It takes about 24 hours to populate on your ancestors profiles..
You may also want to take a look at the help page for more information.;
Help:How to Get Started with DNA