How to close the link from indexing

To search engines Google, Yahoo!, Yandex and Bing, do not go through specific links and do not index them, and also to not pass on them PageRank, you need to add a special attribute to the link:

rel="nofollow"

For example:

<a href="example.com" rel="nofollow">Link text</a>

See also the information in this attribute in the Google Help Center – Attribute rel=”nofollow”
Information on Yandex – Using HTML tags