Price editing in theme

i would like to add service fee as 12% in my final price and everytime someone wants to book hotel so he/she will pay 12% extra service fee but i don’t know how to edit that price in my WPRentals theme. can anyone help me with this?

thanks

• This topic was modified 4 years, 11 months ago by Jan Dembowski. Reason: Moved to Fixing WordPress, this is not an Developing with WordPress topic

The page I need help with: [log in to see the link]