The script discussed here is generated automatically by Brainstorm, using the menu "Generate .m script". I recommend you generate your own script instead of trying to reuse someone else's, which might be outdated.
https://neuroimage.usc.edu/brainstorm/Tutorials/Scripting#Starting_a_new_script
If you haven't done it yet, I recommend you start by following the introduction tutorials (section "Get started"), and the EEG/Epilepsy tutorial for additional information about EEG:
https://neuroimage.usc.edu/brainstorm/Tutorials
https://neuroimage.usc.edu/brainstorm/Tutorials/Epilepsy