How to register my AirPods?

Register for what?

Unless there is an issue with the purchase date, you should not need to do anything.

Your AirPods warranty should be activated automatically.

You can verify your warranty here: link-> Check Your Service and Support Coverage - Apple Support

If there's an issue with the warranty activation, then follow the steps in the support document you posted from to contact Apple Support so it can be updated.

The article you came from provided complete step-by-step instructions for reaching out to support.

Here are a few additional support options:

Get live expert assistance by contacting Customer Support by phone or chat:

• Call Apple Support at 1-800-APLCARE. 📞
• International Support. 🌐
• Contact Apple Support. 📝
• Live chat using Messages. 💬