D-Link DNS-320L User Manual page 120

Section 4 - Configuration
When editing the quota, make sure the size is not smaller than the user
quota on his/her account.
Click Yes to change the quota.
The wizard is now complete and will display a summary of the modified
group settings.
Click Previous to change your settings or Finish to end the wizard. Exit will
cancel all changes you made.
D-Link ShareCenter DNS-320L User Manual 114