When you are signed in, the RealGuide button will change to . Also, the Sign In command in the RealPlayer menu will change to Sign Out.
To sign in, select Sign In... from your RealPlayer menu.
You can set RealPlayer can use the Keychain service provided by Mac OS X. Just choose to add your password to your Keychain when prompted in the sign-in dialog or when you first set up your account.
Note: Even if you choose not to add your password to your Keychain, the last successfully logged-in e-mail account address will appear in the sign-in dialog.