Only showing one Column, when it is supposed to be two

My blog looks like everything has shifted to the Left of the page, and it is supposed to have two columns on the right side of the page. I do not know how this happened, and it would be nice if I could get it back to it’s originaly position with the two columns on the right side, and still have space on the left side.

I guess another question is if I could change the look of the Theme so that I have One column on the right side and another column on the left side. I would prefer this. I am nervous to change Themes now that my blog is up and running, but I could if that is my only option.

The address to my blog is: https://www.midwestwakesurfingblog.com

Thank you for you help. Jon T