There is a button to edit your post BTW...
Um...
If I think I know what you're asking...
You have to unzip the downloaded map into the correct folder. Half-Life will read a .BSP file. Just take the .BSP out of the zipped file (By extracting using a program such as WinZip), and type what you need to in Consol...
For more obvious help, please click the nice link that says
"Where to Start"
It is located on the left of your screen... under Site Stuff.
[EDIT] Damn! you beat me SariBous!