To create a new super user, first login the WM server,

Action:

Open command prompt, enter cd C:\Cambium\WM\server\bin (Your WM Installed directory)

Enter createSuperUser.bat db_user_name db_password new_superuser

For example, createSuperUser.bat wms wms test

Testing: 

Then login using new user (test).

Go to Tools>Administration>Security Administration>Users

Select disabled user, on right hand side a panel will open. Go to User Profile Tab and click on "Setting Profile"

Uncheck the option "No Change in Status" and change the value of "Select the status to be set for this user" to enabled.