To create a Facebook app, first visit developers.facebook.com while logged in to your personal account, and follow the prompts to create and app.
Once you've created an app, from the Yovigo main menu, choose "Marketing" then click "Facebook App". Enter your Facebook App ID, and your Facebook App Secret in the fields provided. Click "Add Facebook App"
If you have a Facebook page set up for your business, you can add your app to your business's page by clicking "Add Julie's Flower to Facebook". From the drop down box, choose the page to which you would like to add your app.
Then your customers can go directly to your Facebook App from your business's Facebook Page.
Should you need to update your facebook app credentials, you can do so by visiting your website's General Settings page and clicking the 'Facebook App' tab.