How to Bind Accounts on Androids

To protect you game progress from being lost, please bind your account with a Google Play account or a Facebook account. Click your avatar→Settings→Account→Bind Account, choose Google Play or Facebook to bind your account.

Note:
A Google Play account or a Facebook account can only be bound with one account. So please check whether your Google Play account or Facebook account has already been bound with other games or not before you bind it to your account.