N/ui/serverWidget Module
Field.setHelpText()
Method Description: Sets the help text for the field. When the field label is clicked, a popup displays the help text defined using this method.
Returns: The serverWidget.Field object
Supported Script Types: SuiteScript 2.0 Suitelet Script Type and SuiteScript 2.0 User Event Script Type (beforeLoad(scriptContext))
Governance: None
Module: N/ui/serverWidget Module
Since: 2015.2
Search NetSuite - https://system.netsuite.com/app/help/helpcenter.nl?search=Field.setHelpText(options)

// Code Example 1

//Add additional code

//...

var form = serverWidget.createForm({

    title : 'Simple Form'

});

var field = form.addField({

    id : 'custpage_textfield',

    type : serverWidget.FieldType.TEXT,

    label : 'Text'

});

field.setHelpText({

    help : "Help Text Goes Here."

});

//...

//Add additional code



//SOURCE: https://system.netsuite.com/app/help/helpcenter.nl?fid=section_4335195721.html