You may delete users from the Account setting module from the WMS. First go to the account setting and click on the Team members from the sub module to view all the members which are currently registered for the WMS.
Next you will be needing to search or from the scroll down search for that particular user which you want to delete, once you have found the user, next on the extreme right side of each user you will find an arrow option click on the arrow option for deletion and deactivate options from here now you can either delete or deactivate the users.
