I asked for the full url but anyway try the url ending with:
/cgi-bin/cp.cgi
Just change the file name from ultimatebb.cgi.to cp.cgi in the url

It is classic not threads.
So future goto the forum:
https://www.ubbcentral.com/forums/ubbthreads.php/forums/32/1/UBB_classic_Version_6_Assistan

Blue Man Group
There is no such thing as stupid questions. Just stupid answers