For partners select Add partner/ex then Add patner already on tree, serech the other person's name, then select if they're a primary, ex, or extra partner.
For friends, select More actions... then Add friend alreay on tree, search the other person's name, then confirm your selection.
For parents/children go to the person that's the child, select More actions... then Set parents, search for the parents names, then confirm your selection.
