Select 'Submit Contribution Schedule' using either of the links as highlighted in the image below to take you to the contribution schedule menu.
Select either 'Pre-fill Schedule from Previous Month's Data' or 'Pre-fill Schedule from Payroll Data' depending on whether you have the details on a spreadsheet or not.
Please refer to your scheme administration guide if you would like more detailed instructions on submitting a payment. The administration guide link is on the left hand navigation bar - as shown in the image above.