We don't 'delete', or 'remove' users as user accounts are tied to historic change events.
In the Security module, from Manage Users, click a user code to edit the user.
In Edit a User, change Active User to N.
Change Lock Account to Y.
Optionally, remove any associated groups.
Click Update.
For more information on managing users and groups, please refer to Novari ATC Administrator, Security and Administrative Reports User Guide.