Options to control look and feel of Add-ons
Step 1: Click on SETTINGS link on the home page
Go to Appearance tab to view available options. Most of the options are self explanatory.
Add On Options on Product Page
Add On position is controlled by "Add-on Position" under Placement within the Product Page tab.
Default option is to display the Add on above "Add to Cart" button as show below:
Second option is to display the Add on below "Add to Cart" button as show below: