How to add left sidebar widget area

Hello.

I have searched through these forums looking for an answer to my question, but I am simply not following what's being said/cannot find what has been recommended--at this point, I feel like a complete idiot and very frustrated.

I would like to add a widget area to the left sidebar. I am using Montezuma theme. I have a very limited understanding of technical jargon. A question that seemed similar to mine suggested I search for "widgets" in the "limited PHP code" dropdown box but that was fruitless. I attempted to add something from the dynamic widget area into the CSS file but...I have no idea how to do any of this. I like the Montezuma theme more than any other I've found since using Wordpress but I am beginning to worry that maybe my skill level is just too low to use it. Please help! My blog is www.corynicastro.com