Yeah, the help-file is very outdated... I kind of hope that someone will offer to write a new one so I don't have to
Well, anyway, the ignore-filter:
Press the analyze-button on the toolbar. In the window that pops up there is a button called 'Edit Ignore List'. Click it. Another window pops up. If you want to add something, press the 'Add' button (the window changes), select whether you want to add a file or a registry-entry and click browse. When your done browsing simply click 'Add It' and your done.
Hope this is clear enough, if it isn't, please ask again.