Change Social links icon in theme Sela

Hello,

I am using the theme Sela and I want to have in one of the social links in the footer a contact link. without using mailto but by linking to the contact page that I have created.

I tried installing the “Menu Social Icons”, but basically it forces me to use mailto once I select the envelope icon. I also tried “Better Font Awesome” but the icon appears next to the link and not inside of it.

Is there a way to make sure it shows an envelope?

The website is mzereba.net