Social Icons: Whatsapp

Hello my friends,

how do I add the Whatsapp link to the Social Menu?

I simulated the code in the Chrome Inspector and it worked:

<symbol id = “social-icon-whatsapp” viewBox = “0 0 27 32”>

But, I would like to know how to just link and get automatic like Facebook and Instagram.

https://api.whatsapp.com/send?1=en&phone=5511000000000

The page I need help with: [log in to see the link]