I use this all the time, its not as hard as it looks.
first open the program,
it is like command prompt and is in the z:\ drive

you need to mount the drive your games are in:

my games are on my d drive in a folder called dosgames so i type
mount d d:\dosgames

now type d:\

now u have your drive where the games are
type dir/w
this will show u whats in the folder

njow say i want to play wing commander, i type
cd wings

then
wings

hey presto

any problems give me a shout