D-Link DWC-1000 User Manual page 55

Section 3 - Basic Configuration
b. Select an account and right-click View Details to view more information.
7. Extend user account usage.
a. Select an account and right-click Extend Session. Manually change the usage time/traffic.
Note: Make sure that Allow Front Desk to Modify Usage is turned ON in the "Captive Portal Billing Profile
Configuration" page.
b. Click Save.
D-Link DWC-1000 User Manual 55