1. In 'Reservation view' click 'Edit' in top right corner to go to 'edit'-mode.
2. Find the room where you want to edit the rate.
3. The room will display one box per day and the last box show the total rate.
If you click a box it will open a popup where you can enter the new rates.
4. Fill in either 'Enter resulting price here' which is the total rate and 'or enter discount percent' which will be the discount from original rate. You can change the rate of a specific day or you can change the total rate. If you change the total rate you will get the options 'Keep daily price differences' which keep the rate diffrence between the days and 'Same price every day' which will distribute the rate evenly for all day.
5. 'Save' in top right corner to apply changes.