1) Go to 'My fishing cabins', select the listing you want to edit and click on 'Edit fishing cabin'
2) Click on 'Rates' in the horizontal menu
3) Click on 'edit', on the right-hand side of either the 'Base rate' or any 'Special Rate' you want to edit.
4) The fourth option from the top shows the option to set the price per Night (mandatory), Week (optional) and Month (optional).
5) One line below you sees the option to set the 'Weekend Pricing'. You decide whether you want to mark Sunday night as a weekend night. The weekend price is the price per night, so not the total price for the whole weekend!