If you need more information about the JPCS templates we use for SAIP, here are the original file (LaTeXTemplates.zip) dating 31 January 2024, before they got updated.  In there, you will find the “JPCSLaTeXGuidelines” but most people won’t need that and should be able to just edit the “123-yourname.tex” file directly, as well as the “iopart-num.bib” with your own bibliographic references to compile the PDF.