Scheduler Usage

I am new to Control M. I have a job setup to run a script but want to be able to set what username the job is using to access the client. It is set as ambiguous domain\server$, I believe through the configuration manager. Is there a variable that can be use to define what username to use when accessing the client to run the batch script when setting up the job? I want to be able to change the login user as domain\userid that's define in active directory.