Add a Device in Google Play

In Settings:
Open the Settings app.
Tap Accounts.
Tap Add account.
Tap Google.
Sign in with the Google account that you want to use on your device.
Once you've signed in, your device will be added to your Play Store device list.
On the Google Play Store:
In the top right corner, click your profile picture.
Click Manage your Google Account.
Click Devices and security.
Under Manage devices, click Add device.
Select the type of device you want to add.
Follow the instructions to add your device.