Visit Lowe's website
Sign into your account (if you do not have one, simply create one as a new member)
From here, you can begin shopping. Once you are ready to checkout, click on the cart icon on the top.
After getting to the Shopping Cart screen, click on Start Secure Checkout
Here, you will be brought to the payment screen. This is where you will add and enter in your Lowe's gift card information. (use the code contained in the confirmation email from Go365)
Once entered, click apply and the balance will be taken off your total amount due.