Include the jquery file reference and SiteHelp.js reference before calling SiteHelpjq function.
The only mandatory parameter for SiteHelpjq function is HelpModel. All rest of the parameters are for customization and optional. The two required parameter for HelpModel are selector and text. A selector could be an unique Id or a class and text is the help text you require to display for a particular selector.
All the customization parameters are optional which you could provide if you need to customize SiteHelp as per your need.