www.office.com/Setup

Manage Office for Microsoft Office 365 login, visit Office.com/setup and enter your login details. If you have not subscribed to Office 365 setup yet, make sure you purchase a licensed product form Office.com/myaccount. After you complete the subscription, you will receive a unique Microsoft Office product key. To activate your account, do the Office 365 login so you can also install Office 365 setup on your computer. Nevertheless, if you are facing trouble to perform Office 365 login, reset your password using the account details you used to create Microsoft Office 365 setup account. 

Find the simple steps to download, install and activate and also Enter Office Product Key at Office Setup Site. Get the Simple Steps here.