How to add a transition to social networks in InstaPage?

Question

css

I’m making a landing in this constructor, for some reason I don’t want to add buttons for transitions to social networks, I tried to add them through html and css, but for some reason it doesn’t read css. Maybe someone has already done what I'm trying to do, please help, I've been breaking my head for 3 days.
This constructor allows you to add social networks, but they are designed to be shared (that is, tell your friends on your page), I need something else, just as usual on the site, you click the Facebook button and go to the Facebook page, and so on.