I can't get the RSS working...

I didn't get How to make the RSS link work (the RSS image, i mean...)...I had a look in this forum with no luck...
Do I need to set-up some file, some configuration or whatever? I have two sites using vShare, they are perfectly working except for the RSS...which i find very useful for Search Engines....
Thanks in advance

strange...one of my sites now works, another doesn't....very strange...same hosting same script---except that one of the site has been translated into italian....