You can either set this up on the tenancy set up wizard when creating the tenancy at stage 2 if you have the information or you can do this within the tenancy whilst you are progressing it by clicking on the rent section.
If you click ‘Custom’ it will pop up a window for you to create your custom schedule.
You will straight away have the ability to add the first 2 payment and the dates but then you will need to click the add button and it will allow you to add as many payments (weekly or monthly) and the the amount you want those payments to be then add them to the schedule. If you click the box to replace the existing schedule it will override it but if you don’t it will add it onto what you have input already.
There is a rent total at the bottom to ensure you match up the rental payments with the correct total amount for the period of the tenancy.