D-Link DSL-2642B User Manual page 52

Section 3 – Configuration
You can configure the port settings on this window by clicking the Select
an application radio button and then using the drop-down list to choose
an existing application, or by clicking the Custom application radio
button and entering your own Application Rule in the field provided.
Click Save/Apply when you are finished with the port setting
configuration. The new Application Rule will appear in the Port Triggering
table.
D-Link DSL-2642B User Manual 52