qmail & DNS/ISP config

[parun]

Hi I have installed qmail & now I am in the last section before qmail testing. How do I set up DNS to my ISP. qmail wants hostname & Domain Name what do I do for this? Fo example my ISP is eidosnet.co.uk.

Please help! I am using this URL for installing qmail
http://Web.InfoAve.Net/~dsill/lwq.html