Step 1: Login to your Magento store’s admin panel (as Administrator).

Step 2: Go to System → select Configuration.

Step 3: Click “Design” tab  on the left menu → Select Footer → Paste HappyFox Chat installation code in the “Miscellaneous HTML” text box.

Step 4: Click "Save Config" button on the top right corner and you are all set!

You can view the HappyFox Chat widget installed on your Magento Store.