How to Sign Into Picasaby Paul Higgins
While you can launch Picasa in offline mode, certain features -- such as the ability to browse images stored in your Google+ Photos or Picasa Web Albums library -- only become available after you log in to the Picasa servers. Sign in to Picasa by using your Google account.
Click the Sign In With Google Account link.
Enter the email address associated with your Google account and your password in the text fields. Click the Sign In button.