Setting a search box field call-to-action will allow users to perform a search on your website from the homepage.
To do that:
1. Open the HOMEPAGE tab in your sidebar
2. Open the TEMPLATES tab
3. Click on Customize
4. Click on the Call-to-Action section to get a drop-down list
5. Select Search Box Field
6. Click on Settings next to the Search Box Field section in order to change the item's position.
Please note that this option is available for premium websites only.