I have entered the wrong shipping address. Is it possible to change the shipping address?

You will need to get back to your order and check on its status and also look and see if there are any option to edit the order. Then you need to contact Apple store chat (if available) and ask Apple employees. We are all other users here and this is not Apple support.

See the article Set up your Apple ID payment method and shipping address on Mac - Apple Support

• Shipping Address: Shows the name and shipping address used for purchases from the Apple Store. Click “Add a shipping address” to enter the postal address for your Apple ID. Click Edit to change the mailing address for your Apple ID.