SickBeard is a PVR for newsgroup users (with limited torrent support). It watches for new episodes of your favorite shows and when they are posted it downloads them, sorts and renames them, and optionally generates metadata for them. It currently supports NZBs.org, NZBMatrix, NZBs'R'Us, Bin-Req.com, Newzbin, NZB.su, and EZRSS and retrieves show information from theTVDB.com and TVRage.com.
ReadyNAS Platform: Sparc
ReadyNAS Firmware: RAIDiator 4.1.7 (may work with earlier versions but that's untested)
After installation of the add-on, SickBeard is already running. It's web interface can be accessed by typing
http://<ip of your NAS>:8888/ in your browser's address field. Or you visit the add-on section in FrontView via "Services -> Installed Add-ons". In the SickBeard section you'll find a link called "Manage Sickbeard". Clicking on it will automatically send you to SickBeard's main screen.
The first action should be to verify the settings under the "Config" section. If you followed the advice given above and installed SABnzbd first then all settings to integrate SickBeard with SABnzbd should already be present. It never hurts to double-check, though. Also you should check the search engine settings and adapt as needed. A nice SickBeard configuration guide for the rest of the various settings can be found on Ainer.org.