Fedex Saturday Delivery Fee and Surcharge

-- url of the page with the problem -- : aquacorals.com
-- HikaShop version -- : 3.1.1
-- Joomla version -- : 3.7.2
-- PHP version -- : 7.0.19
-- Browser(s) name and version -- : FireFox 53.0.3

How can I get Hikashop to charge extra for Fedex Saturday Delivery?
Is it even possible?

Hello,

What is "Fedex Saturday Delivery" ?

If you want to add additional fee on shipping depending custom rules, you will need to have a custom plugin.
It can be a customized version of Fedex so you will interact with the shipping price directly or with a generic HikaShop plugin to add "additional" lines in the cart footer.

Regards,

What would be the cost to having that created?

I'm afraid that you misread my message :

What is "Fedex Saturday Delivery" ?