Remove Nav bar from all "post"

Hello….. a real newbe with one simple question (hopefully).

Website: maxwhip.com
Template: Discover.

On the home page I removed the navigation bar on the right bottom successfully. Now I want to remove it from the “Post” pages…. Can someone tell me which .php page to remove it from? I am talking about the long Nav bar that has Recent Post, Recent Comments etc….

Thanks for your help!
Russ