Hi, are you trying to enter a test on your profile or are you trying to download your raw data so you can upload to Gedmatch?
To enter your test on your Wikitree profile, you would only need your username on Ancestry. You should be able to enter the information here: https://www.wikitree.com/wiki/Special:DNATests Wikitree doesn't currently use your raw DNA data at all. It just autofills a link to your test data (like username or Gedmatch number) on any relevant profiles so that others can find you easier and compare to possibly confirm relationships with DNA.
If you are trying to get your raw data to upload to other sites, the instructions are here: https://support.ancestry.com/s/article/Downloading-DNA-Data?language=en_US
Mags will actually be doing a Legacy Webinar on the DNA features of Wikitree in early March. It's free during and for a short time after. You can register here: https://familytreewebinars.com/webinar/using-wikitrees-dna-features-in-your-family-history-research/
