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-separated. Like
   class1 class2 class3