How to make use of 'Icon Name' in Logical link?

I see the option 'Icon name' in 'define logical links' in SPRO. It does not however has an F4. I tried giving the name of image in the relevant skin. But no image appears besides the logical link. Is there something else that needs to be done to get an image besides workcenter link? How to make use of this 'Icon Name' in logical link?