Hi Dracon1x,
welcome to the Apple (user-0to-user) Community!
Re: "Order : My order was delivered by FedEx but I wasn’t home to sign".
If you ordered online from Apple, you can likely go to your order online to make any changes:
See: Viewing & Changing Orders - Shopping Help - Apple
There, you can choose from a topic:
Online Order Status
Check Order Status
Track Your Order
Edit Your Order
Cancel Your Order
View or Print Invoice
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Re: "How do I transfer my order from delivery to pickup?"
If you need to edit delivery or billing information / view pickup information
visit your Order Listing (Opens in a new window) page and sign in with your Apple ID and password.
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If you need more help, you might want to speak with an Apple Specialist at 1‑800‑MY‑APPLE.
or
For: Apple Phone numbers around the world:
See how to: Contact Apple for support and service - Apple Support
All the best :-)