How do I point the FB icon to my FP page?

Hi, I need to add my FB URL to the FB icon, but can’t find anywhere in the theme to do this. I also want to turn off Twitter and Google+. Hope someone can help me with this, otherwise I’ll have to change Themes, which I don’t want to have to do. I know this should be an easy thing to do, but can’t find the Social Media settings in the theme.

Thanks.