Account
Should you have an account for the website newzbin.com, you can fill in your username and password.
This allows you to use newzbin report numbers, bookmarks and RSS feature to retrieve NZB files from newzbin.
Bookmark processing
You can bookmark interesting reports on newzbin.com.
SABnzbd can automatically read out these bookmarks and download the associated material.
When the download is complete, SABnzbd can (optionally) remove the bookmark again.
The checking interval tells how many minutes separate the checks (at least 15 min.).

There are two links extra for diagnostic purposes:
Get bookmarks now : This will read the bookmarks immediately, instead of waiting for the next interval.
Show processed bookmarks : This will show which bookmarks were read.