To change your rent payment due date, please log in to your account https://creditladder.co.uk/login, go to Your Tenancy > Manage > Update Tenancy Details and follow the instructions.
Alternatively, while logged in, you can go directly to the page using the following link: https://creditladder.co.uk/dashboard/rent-change
For security reasons, the edits will go to your landlord/agent for review. Once approved, they will be updated in your account.