I picked up a screw in the tread of my tire, so far no leak but do I need an appointment To have a tire plugged or fixed?

Not really. They usually get right on it

Call them

When the store open for business, you can bring your vehicle in and talked to the front desk. The technician will examine your tire to determine how to get it fixed.

No

No appointment needed

I had to have a plug and had no wait. 🙂