Payslips can't be resent for an entire payrun, but can be resent for each individual employee. To do this, go to Setup -> Employees, click 'edit' for the employee required and select the Pay Records tab. Click 'view' for the pay required, and then click 'Print'. This will create a pdf file containing the printed payslip, which you can email to your employee.
For more information about printing payslips, please see this article.