In order link your progress to Nekki ID, you have to go to the game's Settings > Account, and tap on the orange "Nekki ID" button.

Next you need to choose your preferred means of connecting:

• Your email: enter your email address into the field. After that, you'll receive a confirmation code at that address, which you will need to enter in the game.
• Google account: after you press this button, a webpage will open and you will need to log in to your Google account.
• Apple account: after you press this button, a webpage will open and you will need to log in to your Apple account.

ATTENTION: after choosing one of these options, you have to press the "Continue" button. If you don't press "Continue", your progress won't be linked to your Nekki ID.