You can set the theme of a form by adding a header image, then specifying the colours and font that should be used in the form. You can use one of the default images to set your theme, or upload your own images e.g. a company logo or project banner.
To change the theme of a form:
Click on the Customise theme button along the top of the form window
Choose a header image by clicking on the Choose an Image button
Click on the Choose an image button along the top of the Theme options pane
Click on the Upload tab
Click on the Browse button to select a photo from your computer
Locate and select the image you wish to use, then click on Open
If the image is not correctly proportioned for a form banner, drag the selection to cover the part of the image you wish to use
Click on Done
The image will be added as a form header, and a choice of colours based on your image will be shown under theme colour and background colour.
Choose the colours you wish to use for the form, or click on the + button to add a new colour to the palette.
Choose the font you wish to use for the form by selecting the required option from the drop-down list.
Click on the X in the top-right corner of the pane to close Theme Options.