Hi Dana - and welcome to Wikitree!
A couple of separate issues:
1) DNA matching itself is not done on Wikitree; instead, you need to submit your DNA to one of the testing firms (ancestry.com, MyHeritage, 23andme, FamilyTreeDNA, or possibly others) and see whether they match you with a Dunham there. In addition, once you have had your DNA tested there, you can upload your DNA to GEDmatch.com to look for additional matches. All the DNA information on Wikitree does is to give you leads for possible matches to look for on these other services.
2) The only DNA testing information I see on the profile for Jonathan Singletary Dunham (Singletary-40) is for a Y-DNA test performed by Perry Donham. Y-DNA is passed down from fathers to sons, but not to daughters, so that information will unfortunately not help in establishing whether Sarah Dunham is related to Jonathan Singletary Dunham.