D-Link DCS-1000 Manual page 38

To change the User Name and Password select "Tools" > "Options". The
Options dialog box will appear as illustrated below.
The administrator needs to enter a User Name , Password and Confirm
password into the respective fields. Once all the new details are entered click
on the "OK" icon.
Make sure to save any changes you have made to keep the information
updated.
Note:
Alternatively you can click the Options icon as illustrated or use the hot
key "F10".
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