Adding Custom Social Icons

I want to add the yelp icon. This one is not in the entypo-fontello default set.
The yelp icon is available on http://fontello.com/ as one of the Zocial characters.
So I select it (I take note of the character number=e800) and download it and get a file called: fontello-13441bde.zip.
So I upload that file to Icon font Manager and put in all the code:

layout.css
[#top .social_bookmarks_yelp:hover a{color:#fff; background-color:#cb2027; }]

functions.php
[‘yelp’=> array( ‘font’ =>’fontello’, ‘icon’ => ‘ue800’),]
(NOTE I USED “fontello” not “entypo-fontello”)

register-admin-options.php
[‘Yelp’ => ‘yelp’,]

BUT the icon shows up as the box with “e8” over “00” WHY am i getting this instead of the actual icon?

See social header, top left, first icon here:
http://www.brixenivy.com/newsite/

See also here:
http://www.brixenivy.com/newsite/test/

Thanks for your help.