For some of the Airsquare designs, you can upload a photo/image in the background of your website (If you can't see this option, then background images are not supported by that particular theme). The image file must be a .JPG or .PNG file. Have a look at different websites for inspiration - many websites have patterned tiles that you can use for free, which can make your website look more interesting.
How do I upload a background image to my website?
Go to Website > Settings > Background Image.
Click Choose file to upload a .jpg or .png image from your computer.
You can then choose the Background image style, e.g. if you have uploaded a patterned tile, you can make it repeat to fit the screen; or if you have uploaded a photo, you can stretch it to fit the screen.
Click Update at the bottom of the page to save.
Will I lose my background image if I change designs?
If you change to a design that does not support a background image, your background image will obviously disappear. But if you change to another design that supports background images, or change back to your original design, the background image that you originally uploaded will be preserved.