D-Link DSL-3590L User Manual page 19

Section 3 - Getting Started
To use the mydlink service (www.mydlink.com or the mydlink Lite app),
you must have an account. Select Yes if you have a mydlink account
already, or No if you want to create one. Click Next to continue.
If you do not want to register at this time, click Skip.
If you clicked Yes, enter your mydlink account name (email address) and
password. Click Next to register your mydlink account with the router.
If you clicked No, fill out the requested information and click Next to
create your mydlink account.
At the end of the wizard, you will be presented with a final summary of
your settings. Click Finish to close the wizard.
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