There isn't a link to Fold3 in the Sourcer. I usually open a second browser with the "Show Citation Assistant". That is how you get it to create a citation from any cite. For Fold3, it is almost as easy to just use the info in the left margin to create a citation. Some people consider Fold3 to be the author, but to me, they are presenting the source, the author is the originator, usually the National Archives. I just like to give both credit.