I'm assuming you mean XBMC and that you installed the SABnzbd+ plugin for XBMC on your Apple TV. There are so many typos I'm not sure what you are doing.
Enter the host IP of the computer that is running SABnzbd, if you access it via
http://localhost:8080 that IP of that computer on your LAN. For the API key go into SABnzbd via
http://...:8080/ and then Config->General and copy the key.
If you are running SABnzbd on your Apple TV then this guide looks rather simple
http://wiki.awkwardtv.org/wiki/SABnzbd however its a little out of date