In the SEO  ribbon you have Robots . "Robots" or "crawlers" are the names for what search engine uses to find information about your page, the robots.txt file will help search engines find content on your site easier, or will tell them not to look at some parts of your site if you so choose.
If you click on Robots, a window name Robots  will open. Here you can Upload , Remove  or Download  your robots.txt file. You can aslo see the content  of your file.