In order to download pay slips through the Employee Self Service Portal, you simply need to click the 'Pay slips' option on the left side of the screen:
The next screen will allow you to choose the pay period for which you want to download a pay slip for.
You simply need to click on the chosen date to open a new screen which is your pay slip. You also have the option to download the pay slip as a PDF, or have it emailed. The email will be sent to the address supplied in your employee details.