Carry out the following steps:
Go to the dashboard and click on Attributes in the Pages and Themes section.
At the bottom, click on the Add Attribute drop-down box and select Image/File, then click on the Add button.
In the next screen, enter
background
for Handle andBackground
Picture
in Name. The handle is what you'll need to access your attribute from the code. You can see this on the following screenshot:Click on Add. The Background Picture attribute has been added to the available attributes.
Go back to the Dashboard and click on Page Types.
Click on Settings next to the first page type.
In the list of attributes, check the checkbox next to Background Picture. This ensures the attribute is displayed by default for each page of this type.
Click on Save.
Do the same for all page types where you'd like to use this attribute.
Go to the home page by clicking on the Return to Website button on top.
Move your mouse cursor over the Edit...