gsasso on "How do I add a Twitter 'share a link' button at the bottom of every post?"

First off, I'm not a coder so please be concise if you can because I won't be able to figure it out if it's technical.

I'm using Wpengine with the ThemeMin theme. http://resetrewind.com/

I know I'm supposed to generate the code here but where do I put the code?
https://twitter.com/about/resources/buttons#tweet

I want what The Bloggess site has: http://thebloggess.com/
A tweet button for each post, placed at the bottom.

I've tried the TweetMeme widget but it was place at the top and messed up the post formatting so that didn't work. If there's a widget that works that you know of, let me know.

Thanks in advance.
Gio