Install it on the checkout page so when someone wants to order something, they can calculate how much it will cost for shipping and choose the shipping method like standard, expediated etc. The customer will type in their zipcode/postalcode and fedex calc will tell them how much it is to ship, they can also choose different shipping method.
There is already a feedex account created and all information will be shared to the right person to complete this [url removed, login to view] information you'll need to launch the application with FedEx has already been done and the production key is also already available. The task left to do is to install it on the site's checkout page.
My Budget for this is no more than $50 so don't bid if you want more.