After reading Yoast's post on Affiliate Links and SEO I was interested in blocking the search engines from crawling certain links like that contain /go/ and /xyz/
So first question is: How do I type it? Disallow: /go/, /xyz/, /etc/ or some other way?
Now, unfortunately I have not made it that far because I cannot find where or how to modify the Robots.txt file.
Yoast writes in his WordPress SEO Plugin page:
Edit your robots.txt and .htaccess
Editing your robots.txt and .htaccess files has never been this easy: you can edit them straight from the Files menu of the WordPress SEO plugin, so you can easily check and or update those files and keep it all nice and clean.
I do find the .htaccess under the menu specified in his explanation, but that is all I see. Here's a screenshot
Please note that I had All in one SEO Pack and Google XML Sitemaps plugins previously active although I have yet to delete them.
Thanks for your help