You will need to sign into RealPlayer with the email associated with your RealPlayer Plus purchase which is your Comcast email address.
Once you sign in with this email address, the Plus features will be activated and you can create a story longer than 30 seconds.
You can find your Saved Stories if you click Stories --> Saved tab in RealPlayer
Please note: If you've changed computers, you won't see it. You can see it here only the PC you saved the story.