Since you are using one of our templates, you first require to remove the background image. Enter the DESIGNER window by pressing the DESIGNER button on the top toolbar.
In the Designer tab, select the BACKGROUND IMAGE. Here you can remove the image of the page or just the background of the form by pressing the X button.
Once you have removed the back ground select the COLOR SCHEME. Here you may also change the color of the background of the page or just the form.
Once you have complete, please do not forgot to save changes.
Please let us know if you require additional information.