How do I add an additional paying tenant to a letting?

1. In the right-hand 'Letting Menu', click 'Rent Schedule'
2. Click 'Add Paying Tenant' highlighted below

3. Select the Tenant to add to the rent schedule and the rent amount that the tenant will be paying. Optionally, include a rent payment reference that the tenant should include on any payments of rent. Then click 'Add'

To adjust the rent amount that any of the other tenants are due to pay, click on their rent amount and update accordingly.