I may be asking in the wrong forum, so apologies if I am

I used to have a link to our club facebook page on the main page. I see that this forum has social media link on the page banner. How do I add those to my site? I've found instruction for doing this for 3.0 but not for 3.1. i tries following the 3.0 instructions but they seem fundamentally different. I was hoping there was an extension to allow this but if that's how it's done I couldn't find it?
Also there is a menu bar under the banner on this site? How would i go about adding one of those? Is it a theme, style or extension? Sorry, obviously clueless as to the structure of phpBB

Thanks
Niall