Need to remove 'Categories', 'Archives' from side

I’m looking to get rid of all the sidebar stuff entirely so that only the pages/posts will appear when viewing the website.

here’s my link:
http://daltonjobson.com

Where it says categories and archives I would like to make that all disappear so my pages take up the full width of the blog borders. Is there a way to delete code in the editor to accomplish this? thanks.