this may be a stupid wuestion but im new at this. i wanted to install phpnuke and wondered what to set after www.exploit.trap17.com/---------- replacing the --'s to make it go to www.exploit.trap17.com not www.exploit.trap17.com/--------- i hope that i explained my problem wll enough for someone to under stand. thanks for the help.

Hummz, you shouldnt use the installer in cPanel, its outdated, if you know how to set up datebases etc you should download the package and install it in the public_html (The part of it with the index.php, config.php etc in it, I think the folder is called html)

i think i got your problem,
you just install phpnuke in a different folder,
lets say www.exploit.trap17.com/phpnuke/ then at your cpanel go to Manage Redirects, there you can fill in the /phpnuke/ folder en redirect it to www.exploit.trap17.com. (do fill in temporary)
now everytime you visit www.exploit.trap17.com you get redirected to the /phpnuke/ folder

But if you manually upload the files from the html dir to the public_html dir you would have the same effect and the newest version so that means no need to upgrade anymore

if you download the package and manually install it it should work, just install it at the www directory (same as public_html directory)
or as wassie sayd, put it on a redirect, will work fine too.