You can allow your fiance and others access to your online guest list by having them log in to The Knot using your email address and password. Please remind them to log out when they are done, so you'll be able to access your account.
Remember, when you allow others to log in to your account, you are giving them access to all of your personalized information (saved gowns, budget, checklist, etc.).
Go to The Knot Guest List Manager
Go to the Help Center
Guest List Manager Help