See attached video or follow the steps below:
Visit www.office.com and select Sign In
Login with your company email address and click Next
Enter your company email address password
Click Install Office located in the upper right of the landing page. Select Office 365 Apps to begin downloading the software.
Click on Run to begin the installation process.
This process could take between 10 to 30 minutes based on your Internet connection. Office 365 will be installed once complete.