I don't know which JIRA version you're currently using, but you should have administration rights, then go to user management section, then create the user. Don't forget that the newly created user must be part of jira-developers group to be able to be assigned with a task. You can change groups for an existing user in user management section too.
Only administrators can add users to the system. If your company has a naming standard you could have the administrator add their userid and email to the system as soon as they are scheduled to come in. Short of that, you're out of luck. Only valid JIRA users can have issues assigned to them.
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