Social Icons

In this post i am referring to

To the youtube, facebook twitter icons I want to remove the youtube one and add instagram and snapchat icons then add their respective links without messing up the whole layout.

Also I need the actual Instagram, snapchat icons if you already have them or do I just google/image to find them?

Any docs on how to do all this? If not please explain to me how to do this without me having to hack the thing.

All she want is to let her visitors click on these different social icons so they can visit her accounts on those websites.