From here : Background image[1] You can select an image for your website page[7] background[8].
If you have already selected any image then by using remove button [2] you can remove current background and by using change image button[3] you can change image option you can change your background image.
By using other options you can set background properties like Background repeat [4] , Background positions [5] and background attachments [6],
We removed services section background for show background[8] , if you want background image in your website please select boxed layout of your website.