In Bookwize, you can set your hotel's logo in three different spots; the Hotel Logo in the Property Settings, the Email Logo in the Booking Engine Basic Settings and the Booking Source Logo in the Booking Engine Theme Settings.
Hotel Logo
It's the main logo of the hotel in the system and the one that is used if the other logo fields are not provided.
Visit Settings > Property, Basic tab and scroll to the Hotel Logo field.
Click on Upload and add the file of your logo. Please note that the logo's file must be gif, jpeg, jpg or png and its maximum size should be 250px x 250px.
Click Save to store your changes.
If you need to update the email or booking engine logos, you will need to visit the respective settings section.