Office.com/setup-If your computer or device meets the requirements, go to office.com/setup Find your Product Key, a 25-character code, located on your receipt or on the back of the card inside your product packaging. Enter the Product Key and click Next. From there, you will be prompted to sign in to your Microsoft account.Other wise contact our toll-free number to get instant support. Our technician available for 24*7 and they are happy to assist you.