How to remove sidebar from post page and set full width

Basically just like the title says. I’m trying to remove the sidebar from the post page only, and as well I’m trying to make that page a full width page. I’ve read a lot of ways on here to do it but none work with my theme. I’m using Organic Shop theme from themeforest.net and other sites and my site is https://www.oakleybars.com thanks hope you can help