You can create an account for your fiancé, that is linked to yours, which will allow him/her to receive notification emails and login to edit your wedding website with their own credentials.
To add your fiancé as a second user on your account:
1. Log in to your account, and select Wedding Profile
2. Select the link Create an account for your fiancé located directly under the "Fiancé's last name" field.
3. Follow the registration instructions; it is virtually the same process as when you initially registered your account.