A "Renewal" will extend your membership term for another year from your expiration date if your membership is still currently active. For example, if your membership is set to expire on July 1st, 2009 and you Renew, your membership will now expire on July 1st, 2010.
If your membership hasn't expired yet, you can Renew your membership by going to the "Account" section and clicking on the "RENEW" link.
If your membership HAS already expired, you can Renew your membership by going to http://www.bonjovi.com/join and clicking on the "RENEW NOW" link for the package you would like.
If your account has already expired, then it will extend for a year from the date you purchase your Renewal.
An "Upgrade" will upgrade your current package to a higher package for a pro-rated amount, but will NOT extend your membership for another year. For example, you can upgrade your membership from "Online Only" to the "Standard" or "Signature" memberships.