To add the variable or upfront percentage that you ask the Guests to make the advance booking, please go through the below steps:
On dashboard, click on Prices.
By default, you will see the 25% in the text box, you can change this value as per the percentage you require.
Click on Save button to save the upfront percentage.
Please feel free to contact us at firstname.lastname@example.org , if you have any further query.