Here you go:

Changing Passwords

Follow these steps to change the password for a WCS user account.

Step 1 Start WCS by following the instructions in the "Starting WCS" section on page 2-10.

Step 2 Log into the WCS user interface as a user assigned to the SuperUsers group.

Step 3 Click Administration > Accounts to display the Change Password page.

Step 4 Click the name of the user account for which you want to change the password. You can change the password here or through the User > Edit window.

Step 5 Enter your old password, unless you are the root user. (A root user can change any password without entering the old password.)

Step 6 On the User > Username page, enter the new password in both the New Password and Confirm New Password fields.

Step 7 Click Submit to save your changes. The password for this user account has been changed and can be used immediately.

http://www.cisco.com/en/US/docs/wireless/wcs/4.1/configuration/guide/wcsmanag.html#wp1051619