You can easily install 8x8 Work for Desktop on your computer, and then log in to the app using the credentials sent to you by your phone system administrator.
In addition, if you are an administrator deploying 8x8 Work for Desktop throughout your organization, refer to information on machine-wide installation as an admin on the 8x8 Work for Desktop download page.
To install 8x8 Work for Desktop for yourself as a user:
Download the application, and go through the installation wizard.
Open the app. Once 8x8 Work for Desktop opens, you are able to log in.