Click on the "Add+" tab at the top right of your screen and click on "DNA Test information"
It is important to note, we do not upload RAW DNA to WikiTree. The best way to enter DNA information so others can compare with you is to upload your DNA first to www.gedmatch.com. It is a free website that allows people who have tested with different companies to compare results with each other.
Then you can come back and enter your Ancestry information along with your Gedmatch ID number that corresponds with that test.
Hope this helps!