Step 1. Go to Dashboard » Reservation » Add-On .
Now, you will see below page.
Step 2. You have to buy these add-ons to use. Simply, click on BUY NOW and it will redirect to product page. From there, you have to Add to Cart and then do payment.
Step 3. After payment is completed, you will get the Activate & Deactivate buttons.
Buy & Activate all Add-Ons and take the advantage of every Add-On.