If you are asking how to find out if another WikiTree member has added one of your ancestors to Wikitree, you should be working with the name-search engine and the Surname Genealogy pages.
At the top of every profile page, you'll see blanks where you can enter a first and last name to search Wikitree for a person. We are limited to 100 search results, so if you are shown 100 results you'll need to refine the search.
Also, if you simply enter a surname in the search box, you'll be taken to the Surname Genealogy page, where you can see all profiles with your surname of interest (but only if they had the same spelling that you entered).
