How do I get FedEx to pick it up?

You would need to call FedEx with the tracking number and request a pickup. Taking it to one of their drop off points is a whole lot easier than waiting for them to show up on a particular day.

I dropped mine off at a FedEx office; they also have dropoff at Walgreens and some grocery stores. Use the following to find a location near you: https://local.fedex.com/en-us/

The following has information about pickups but I have no personal experience with it: https://www.fedex.com/en-us/shipping/schedule-manage-pickups.html