The intranet is for board members and other people with a @gallery1313.org email address. You must be logged in with this email to access the site. A simple way is to log in to gmail in another tab. If you are logged in to another profile, switch to your @gallery1313.org profile.
Next, click this button:
If you see a 404 error, you are not properly logged in.
https://sites.google.com/gallery1313.org/g1313-intranet/home