403 Forbidden

I can go to my site, log into my dashboard, even look at some things on there. But if I try to look at plugins, pages, and some other pages I could normally view, I get a blank page and

” 403 Forbidden
Access to this resource on the server is denied!”

So I think my permissions are screwed up. Is there anyway you can tell me how to set the permissions right, or what they need changed to. Thank you if you anbody can help me.