How can download payslips or email payslips to all my employees?

Go to the Pay Runs tab.
click Payroll History and select a completed pay run.
click an employee.
Click Download Payslip or Send Payslip from the right sidebar.

Download Payslip

To email payslips to all employees involved in this pay run, click Send Payslip from the top right corner of the screen.

Send Payslip