activating Windows 10 on the 4GB/32GB

I am new to these message boards so bear with me and I hope I'm posting this in the right place. I have the 4 / 32GB version of the lattepanda and everything's working great I've had it for about 3 months now and it's been running 24/7 controlling my home automation however, I would like to activate the Windows 10 operating system how do I go about doing that. It currently shows unactivated. Any help would be greatly appreciated thank you.