In order for an application to use your FriendFeed information, it has to know your remote key. If you’ve changed your mind about using an application that you entrusted with your remote key, you can reset the key so that application can no longer access the information. You must then give the new remote key to any applications that will still access your FriendFeed.
1, Go to FriendFeed and login to your account.
2. Go to http://friendfeed.com/remotekey.
3. Beneath your remote key information, locate and click the Reset remote key link.
4. When prompted to confirm the action, click OK.
You will be assigned a new remote key.