Avision @V2800 - Manual (Page 164)

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Edit:
If you wish to edit a specified local user, choose the account from the account
list and then click the Edit button to prompt the Edit Account screen. Modify
the required changes and then click Update to save the settings or Cancel to
return to the Account Management screen without saving any latest changes.
Delete:
If you wish to delete a current local user, select the account from the account
list and click the Delete button. A warning message appears to confirm your
deletion. Click OK to confirm or Cancel to exit. Click Update to save the
settings or Cancel to return to the Account Management screen without
saving any latest changes.
Note:
You can make multiple selections by choosing one group and then pressing the
Shift or the Ctrl key to delete them at once.