Having trouble excluding a category from main blog

I want to have posts of a certain category be accessible via a menu link to that category tag, and not show up on the main blog post.
I’ve found the category ID that I’m supposed to put in the “Exclude category” section of the settings (Genesis -> Theme Settings) and it still won’t work for some reason. Not sure if I’m doing something wrong.

Within the URL it says “category&tag_ID=573”

I would put the 573 in the space to exclude, correct? or would I put the slug name? It seems to have posted on the main page as well.