If you were invited to work on a yearbook, you should receive an email with a link you can click on to see the project. If you do not see the project, there could be a couple reasons why.
1. You have not created an account - If you have never used Creator Studio before, you will need to create an account before you can work on any projects. After clicking on the link in your invitation email, click the "Create Account" button and fill out your information. Once submitted, you will need to login using your email address and password you just entered. Once logged in, you should see the project that you were invited to.
2. You need to start a new session - If you already have a Creator Studio account and you still have an active session from the last time you logged in, you may need to start a new session before you can see the new project. To start a new session, simply log out by clicking on your name in the upper right corner and choose the "sign out" option. Then simply sign in again and you should see the project you were invited to.