Changing colors:

• Go to Add or Edit form.
• Click on Settings tab, there you will find all the settings.
• Settings present in Design Settings section are related to form styling.
• Set the Label Color, Error Message Color, Required asterisk’s color
• Change the background of form by adding a
  • Background color
  • Backgroud image.

Designing by adding classes:

1. Click any of forms elements and the Element-Configuration box will open in right sider.
2. Here in the Element-Configuration scroll to bottom and you will find the “Add Custom Class”
3. Add custom css classes from bootstrap. You can add multiple classes by simply space seperated. Like
   class1 class2 class3