Hmm, it's still not clear to me which eye material they are referring to, and (as Miss Nancy said) why it would have a bump map at all. Maybe someone else who has the product can help with that, if necessary.

But anyway... here's a screenshot of how to plug back in a disconnected bump map, using A3's SkinTorso as an example. In this shot, the Bump Map is shown already plugged in.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)