In every listing you should see right next to the option "Report Broken Link" .. "Add to My Sweepstakes" .
1. Close all Internet Explorer Windows
2. Click Start, then Control Panel
3. Click Internet Options
4. Click the Advanced Tab
5. Click Restore Defaults
6. Click OK.
7. Close Control Panel
8. Re-open Internet Explorer and you should now see "Add to My Sweepstakes" .