Same place where you would add your Test info for whatever DNA you took. From your wikitree profile, select the Famly Tree & Tools tab, then Wikitree Tools from the options at the top. Next to last item is Tests of Wadene's DNA. Selecting that will allow you to enter your Test Details, Gedmatch ID, and yourDNAportal.com ID.
It will take at least 24 hours usually for the DNA process to recalculate connections, at least overnight.