help with 3rd column…yes i already searched…

I am trying to add a 3rd column (2nd side bar) to my website. I have searched through the forum and tried some of the suggested sollutions but my knowledge of PHP and CSS seems not to be enough, so if anyone can point me in the right direction I would really appreciate it! Thanks in advance!

I am using Freshy 1.0 https://themes.wordpress.net/columns/2-columns/512/freshy-10/ and my website is https://babibubebo.com

Thanks again!