Should I take class time to explain software?
"Modern Approach": I would suggest creating a video demonstrating how to use the software. Free software like CamStudio makes this easy to do. There might even be a video already online.

The video would allow students that need the assistance to view the video outside of class or follow along in class. This puts the freedom in the students hands and would also free up your time to focus on the subject matter. This could save time for future classes as you integrate it into your class structure.