[Plugin: NextGEN Gallery] Album thumbnail

I have pages with links to Albums, within these albums there are galleries & more albums with galleries within those albums.

I’m having trouble displaying Album Thumbs. View HERE
If I assign a pic to an album it will show on all album thumbs on that page. See HERE

I have certain pics I want to assign to these albums. How can I do this?
I have searched for hours trying to find some answers, but can’t seem to find any.

Thanks in advance.