Where to find social buttons in code (SEO purposes)

Hi, can you tell me where to find social buttons on bottom and top of each page.

Top : «…<i class=”fa fa-twitter”></i>…»

Bottom : «…<i class=”fa fa-twitter”></i>…»

Suggestion : I am working on my SEO and want to keep Google link juice on the website, so I need to make «rel=nofollow» links for this type of outbound link.
In my case I use 4 social networks so it add for each Arcana page 8 Link Juice leaks (4 top, 4 bottom).
Link juice is divided by number of page links, less you have external links (facebook, twitter etc) more you concentrate link juice for internal links (and gain positions on Google serp).
Maybe you could offer this option without need to correct the code (follow or nofollow for outgoing social links)
It would save some precious link juice.
See this article on the topic : https://moz.com/blog/are-you-leaking-juice

Thx
Eric