D-Link DES-1526 - Manual (Page 64)

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Set Password
Password is the invaluable tool for the manager to secure the
Web Management Switch. You can use this function to change
the password.
If you forget the password, press the “Reset” button in the rear
panel of the Switch. The current setting includes VLAN, Port
Setting… etc. will be lost and the Switch will be restored to the
default setting.
Figure 40.Set Password