Hi Tom,
Have you tried this method;
Changing Your Password
The user password is set when the user is created. Use the following procedure to change your password.
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Note Your login determines whether you can use this option.
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Procedure
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Step 1 Select Admin (Tab) > My Profile > Change password.
Step 2 To change your password, enter a new password in the New Password and Re-enter New Password fields.
Step 3 Click Apply to save your changes or Reset to discard your changes.
From this WLSE doc;
http://www.cisco.com/en/US/products/sw/cscowork/ps3915/products_user_guide_chapter09186a0080364096.html#wp1446214
Hope this helps!
Rob
