You don’t need a registration code your email is your code.
Download the max2play image and burn it to your SD card.
Choose if you want to login via wifi (access point) or lan or WPS. Read more here: Click
When you are in, find the Settings/Reboot tab and fill in the email you used for registration…. Here is a „Walkthrough for Beginners“ :Clik here
Ask here in the forum if you have any problems and we will try to help..