What exactly do you mean? The readme covers it nicely. Looky here:
Installation and usage
Unzip the files from the ZIP file VNS.ZIP to gp:\gpmm leaving the directory structure of the ZIP file intact. This means that there should be a directory VNS under gpmm containing demo1.vns and demo2.vns. There should also be a directory demo1 and demo2 under VNS both containing resources like BMP,SEF and MOD files.
When the program is started press B to see the credits or press A to load a story. After pressing A you are presented with a story selector. Press Up or Down to scroll through the stories and press A to select your story.
When in a story press START to get to the menu. The menu has the following options:
Continue – Continue with the story
MOD playing – Switch between MOD playing in Mono or Stereo
Save – Save your story progress. Only one save per story can exist.
Load – Continue story from last save
Restart current story – Restarts current story
Another story – Stop current story and return to Story load menu
Reset GP32 – Quits VNS and resets GP32
When in a story press SELECT to switch between graphics mode and text mode. This option is mainly for testing when developing a story.
What part exactly do you need help on?