Hi Debbie if i understand your Question Correctly you found your 5th cousin on WikiTree which means you must of found her Profile Page where you can send her a Private Message, if you want to be added to each others Profiles you will have to request to be on the Trusted list , every Profile on WikiTree has a trusted list which is a list of People with full access to that profile ,are you wanting to merge all Profiles of yours and your 5th cousin ?,if i misunderstood and you havent found her profile page but know she is on WikiTree enter her Name in the Search Box which is on the top left hand side of most pages of WikiTree Terry
http://www.wikitree.com/wiki/Trusted_List_FAQ
http://www.wikitree.com/wiki/Matching_and_Merging_FAQ