There are two plugins and they both work basically the same way. It’s really all a matter of whether you like a drop down box to select options, or just clicking those little round buttons next to options.
If you like to choose options by drop box, upload WordPress Meta Robots:
If you like to choose options by clicking little round buttons, upload Robots Meta:
*Note: Robots Meta is no longer supported or updated and has now been replaced with Yoast SEO. You can download Yoast SEO by going to your wordpress dashboard, clicking on Plugins, Add New, and searching Yoast SEO in the search box. Download, install, and activate.
If you don’t want a page to be indexed, select one of the noindex options.
Difference Between Follow and Nofollow
There is noindex, follow and noindex, nofollow.
The difference between follow and nofollow is if you choose follow, Google will still use that page to distribute some of your page rank. So if you don’t want that page to get some of your site’s pagerank, then choose the nofollow.
However, if you have really awesome relevant content on there that Google can follow, then choose follow because it could then help your site’s overall pagerank.
If the page is mainly just PDF documents, choose nofollow. If links to said PDFs have awesome keywords, you may want to choose follow.
But either way, this part of the meta robots plugin is not as important as making sure you choose noindex.
Now you can keep any WordPress page or post from being seen in search results.