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however its a little out of date