I am NO expert, but I just checked this (to be sure). On your home "profile" page, under "FIND", there is a pull-down menu with "SEARCH" on it. After you choose, "SEARCH," Item Number 3 (scroll down past the first screen). THEN, on the right-most box, there is an empty box in which you can enter the WikiTree ID.
Does that help??
Good luck, and continue to learn about and use WikiTree!