D-Link DSL-2520U User Manual page 37

Section 3 - Configuration
DDNS CONFIGURATION
Please enable the Enable Dynamic DNS if you want to use
DDNS.
Choose which DDNS web site to use on the Server Address.
Type which Host name which you registered with your DDNS
service provider. on the Host Name.
Type the username/password on the username/password for
your DDNS account.
After configure the DNS settings as desired, click on the Apply
Settings button to apply settings.
D-Link DSL-2520U User Manual 37