How to add delhivery in track free plugin

Hi,
Please go to settings page, you can add additional couriers under preferred couriers. Please let us know if you still have issues, share your email we will send you the screenshot.

I am not able to add in settings “Preferred Courier Name” option. my email id is [email protected]. Please help to integrate it.

How to add delhivery pickup in wordpress multivender website