Changing social buttons in posts

Hello! First, THANK YOU so much for your brilliant and lovely job! That’s so great! Congratulations! 🙂

Finally, I writte to you because I can’t do changes with a little thing…

It’s about the DIV of “social share” in every post. By default, its showing the Facebook and Google+ buttons. But I like to change Google+ to Twitter. I tried to make this changes directly at the Mozilla Browser (changing the words) but I didn’t found the root and where are this code available for do this changes permanently (styles.css?? content.php??…).

The only I know, it’s inside the DIV “dv-social-share av-social-type-text-icon” at “skepost clearfix” div.

How can I do…? Please, thank you so much! 🙂