How to install the Outlook 365 Add-in.  

Note: You need an active Microsoft Office 365 account to use this Add-in.

First, go into the following Microsoft Store link: 

Press the 'Get it Now' button. 

If you are not currently signed-in, Microsoft will prompt a window requesting your login information.

The browser will be redirected to to confirm the installation.
Press 'Continue' on the pop-up window.

Press the 'Add' button.

The GetReplied Add-in is now installed on your Outlook account for Web and all Outlook 365 desktop applications where your account is used.

You can now 'Open' GetReplied.