Youtube Icon url

I am using the Graphene Theme and in the Graphene Theme Options menu area under Top Bar Options menu I have added YouTube to the list of Social Media however, it is asking for me to enter the YouTube icon URL and I am not able to locate it. When I go to visit my Blog page it shows the RSS, Twitter and Facebook icons and they work great. When I hover my mouse to the left of the last icon in this area a message box comes up and says Follow me on YouTube but the icon does not show.
I would also like to add LinkedIn and Flickr.
Yes I am a Newbie so any help here will be appreciated.
Thanks
DT