How to ignore the posts of the main site in the plugin "Recent post plus"

Hi there. Recently I've installed the plugin Recent Post Plus ( http://www.pjgalbraith.com/2011/08/recent-posts-plus/ ) .

I've tryed it with "Recent Global Post Widget", but it doesn't like cause it shows the picture of the author, and I'd like the widget shows the default picture of the post.

Then I've installed "Recent post plus" plugin which one shows the default picture of the post. The issue now is that the widget shows the posts of the main site which is redundant.

Can you think of any ideas to prevent the posts from the main site are shown.

thanks, Emilio