Hi, Geraldine. If you're asking about DNA matching, Wikitree doesn't and can't do that because it can't view your actual DNA results. What it does is go by the genealogical connections recorded here in the tree.
Now that you've entered that you've taken a AncestryDNA test on your own profile, that information will propagate through the tree to every person shown who might share DNA with you. Autosomal DNA information, like your Ancestry test, will travel up to eight degrees of separation, eight birth events. That means your test info will appear up the tree as far as your 6th-great-grandparents (even though autosomal DNA isn't really useful that far back) and across the tree as far as your 3rd cousins...who can be goldmines of genealogical information.
On your own profile, if you click "Test Details" under your own DNA kit information--or use this link as a shortcut--it will list everyone to whom your test information has been propagated. It isn't DNA matching, but it can give you great clues about cousins you might want to look into for further research.
Edited to add: As new profiles are added that connect to you in the tree, your DNA test info will propagate to them in overnight batch operations...and theirs to yours, provided they've also taken a test. It's automatic; no one needs to do anything. Add more of your own ancestors, connect to branches of the larger tree, and those connection possibilities can spread out impressively far.
Keep in mind, though, that because it's automatic things can look like they're in flux one day to another. For example, someone could change a marriage or parental relationship on the tree at, say, one of your 3rd cousin's great-grandparent's, and the next day you could see whole blocks of profiles appear or disappear as "DNA Connections" depending upon the relationship changes made.