Yay thanx man!
ok in case anyone else is wondering what I did,
I have responsive theme and blog was a page so I had edit subtemplate and find query_posts(“post_type=post&paged=$paged”);
from there I just added additional search parameter
query_posts(“post_type=post&paged=$paged&cat=-3”);
you have to use -3 to exclude it, I tried != at first didn’t work.
Then all I had to do was copy subtemplate I just edited, in my case blog-excerpt.php, rename it, edit to remove – from “&cat=-3” and upload. Templates are in content/themes/themename folder.