You need to be in Business Mode to personalise your business profile. Once you have made sure that you are in the Business mode, select the Businesses tab in the Main Menu.
Select the Settings icon to open up a different window of options.
Select the Edit Profile button.
Scroll down and select the Personalisation option in this menu.
Choose a background photo and select Save when you are done.
You can add a profile picture for your business by selecting the Set button or drag and dropping it into the photo. Your profile picture/logo should be as clear as possible.