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You can create the operator ID for your application by any one of the following ways,
Click Create> Organization > Operator ID.
From the navigation panel, click Records > Organization > Operator ID, and then click Create.
Click Designer Studio> Org & Security > Organization > Operators, and then click New.
You can also create a new operator by performing Save as of the existing operator ID by onclick of the operator Icon (Symbol) on the top right most icon > Operator > Saveas (Preferable when you want the new Operator ID with same preferences).