How to unregister product from account

Hey, I received a MC7000 as a gift, and stupidly registered it before I spent some time with it and realized that 4 channels is simply too much for me at the moment, and I’d rather stick to the basics. How can I unregister to product so I can give it back or resell it to someone else?

https://www.denondj.com/productregistration/customer/

And remove your device.

I don’t see any option to remove my device there. I can see my MC7000, its serial, and all the licences and stuff it comes with, but no button to remove it