D-Link ShareCenter DNS-340L User Manual page 409

Section 4 - Configuration
Click the green + button to create the account. You are
immediately redirected to sign-in or sign up for a Google
account.
Use you Gmail credentials to sign-in (highlighted in red)
or create an account (highlighted in pink). It's better to use
Google Chrome Browser to do this.
Create your Google account by entering the required
information.
D-Link ShareCenter DNS-340L User Manual 407