In preset settings we provide the opportunity to change the header, background, text & link color. If you want to add more option in the settings like Footer color then open the Xml and create another line like the highlighted line:

After editing the XML file open the index php file. You will find the index.php file in this path:
templates\shaper_helix_ii

Then open the index.php file and create a new line like the highlighted line:

After completing the line then saves the file and now you will found new option in your preset settings.