Everything on the Minislack compact disc is installed to your hard disc during a full, unattended installation with all package groups selected (henceforth "full installation"). There should be no need to take something from the compact disc for installation in this case. If you selected an option other than a full installation, only you know what was installed. A full installation is the default.
Perhaps you are looking for the program "pppsetup." pppsetup will help you configure dial-up access. To invoke it, at a terminal as the root user type "pppsetup". If you need help with pppsetup, everything you need to know is at http://www.zenwalk.org/ewiki/?id=DialupModem
. I wrote the original version of the dial-up how-to for Minislack 0.3 and I know it will work for Minislack 1.0.
If you simply want to know how to take a package and install it from an ISO (compact disc image), try searching for instructions on how to do that. Articles written for Slackware will apply to Minislack. If you find nothing useful, try posting on Minislack's Main forum at http://www.zenwalk.org/
If none of this helps, I must again ask what you are trying to do so that I can give you a better answer.
By the way, Minislack changed its project name to Zenwalk beginning with version 1.2. The new project name is reflected in URLs that I wrote.