D-Link DNS-320L User Manual page 248

Section 4 - Configuration
Google requests you log-in to your Google account. You are unable
to use the Picasa feature if you do not have a Google account.
Enter your Email Address, Password and Sign In to proceed.
Google requests you to grant access to Picasa Web Albums. Click
Grant Access to proceed.
DNS-320L 243
D-Link ShareCenter™ User Manual