If your device displays "MAC not registered" and points you to this help page, you've likely purchased hardware from somewhere other than TRMNL.
You will need to purchase a BYOD license (Bring Your Own Device) to use trmnl.com as your server for your BYOD device. You are also welcome to run your own server (BYOS), no license required.
If this is your first device being connected to TRMNL:
Claim your device using your order number and name. Then sign up for an account.
Once you have a trmnl.com account:
With a BYOD license you can easily add your MAC address yourself. Hover over your BYOD device in the top-right of trmnl.com and click on the gear icon, selecting the Developer Perks section. Enter your device's MAC address and save.
More information: https://docs.trmnl.com/go/diy/byod#build-from-scratch-advanced
If you have further questions about using trmnl.com for your third-party hardware, send us a live chat or email [email protected].