To add a citation, note, or photo to a person’s fact in the family tree on the family site, select ‘view profile’ from their card in the tree. Select ‘edit profile’ from the menu on the left, and there you will see the ‘All facts’ option for that individual. There you can add a new fact and choose from many fact categories and types.

If the fact type that you enter already exists in the main profile fact menu on the left (Such as work, education, etc) then that field will be updated as well.