Is there a way to look up the localhost name on a vMA?

I'm new to this and am unfamiliar with linux. A co-worker set up the first vMA. I'm setting up the second. I input the IP numbers and it's asking for the Host name [localhost]. I'm not sure what to put in. So i'm trying to look up what he used. I did ask him and he said to see what he put in the one he set up.

Is there a way for me to lookup the host name / localhost is?

I'm using version 4.1

Sorry if I'm sounding a little dim... well... maybe a lot dim.