I have an idea of what I need to do but I keep falling short of getting it right.

What all do i have to edit to create a redirect to a custom page after the form has been submitted?

PHP Code:
   * @return HTML
     
*/
    function 
RenderGForm($atts) {
        
$params shortcode_atts(array(
            
'form'           => false,                   // Google Form URL
            
'confirm'        => false,                   // Custom confirmation page URL to redirect to
            
'alert'          => null,                    // Optional Alert Message
            
'class'          => 'gform',                 // Container element's custom class value
            
'legal'          => 'on',                    // Display Google Legal Stuff
            
'br'             => 'off',                   // Insert <br> tags between labels and inputs
            
'suffix'         => null,                    // Add suffix character(s) to all labels
            
'prefix'         => null,                    // Add suffix character(s) to all labels
            
'readonly'       => 'off',                   // Set all form elements to disabled
            
'title'          => 'on',                    // Remove the H1 element(s) from the Form
            
'maph1h2'        => 'off',                   // Map H1 element(s) on the form to H2 element(s)
            
'email'          => 'off',                   // Send an email confirmation to blog admin on submission
            
'sendto'         => null,                    // Send an email confirmation to a specific address on submission
            
'spreadsheet'    => false,                   // Google Spreadsheet URL
            
'unitethemehack' => 'off',                   // Send an email confirmation to blog admin on submission
            
'style'          => WPGFORM_CONFIRM_REDIRECT // How to present the custom confirmation after submit
        
), $atts) ;

        return 
wpGForm::ConstructGForm($params) ;
    } 

Change the confirm to 'true' correct?