PLEASE HELP WITH PLUG IN!!!

I UPLOADED A PLUGIN AND IT WAS A ADVANCED CATEGORY EXCLUDER PLUGIN. I ACTIVATED IT AND THEN WENT TO POST SOME MATERIAL. THE PLUGIN IS SUPPOSED TO HELP ME PUT CERTAIN POSTS IN CERTAIN CATEGORIES WITHOUT IT ALWYAS BEING POSTED TO MY HOME PAGE. I WENT TO TRY AND WRITE SOMETHING AND IT WOULD NOT LET ME DO IT. I CLICKED ON THE “ACE” ON MY DASHBOARD AND IT WENT TO A “404 USER URL NOT FOUND”

CAN ANYONE HELP ME WITH THIS? I HAVE TRIED FOR OVER TWO WEEKS (AND GOT ALOT OF HELP TO WHERE I AM AT…THANKS YOU KNOW WHO YOU ARE) BUT THIS WAS JUST ANOTHER HURDLE FOR ME TO GET OVER.

ANY SUGGESTIONS? THANKS!