To use Grammarly with Microsoft Word, you can do the following:
Go to the Grammarly website (https://www.grammarly.com/) and sign up for a Grammarly account.
Download the Grammarly add-in for Microsoft Office from the Grammarly website.
Open Microsoft Word and click on the "Add-ins" button in the ribbon.
Click on "Manage Add-ins" and then select "Add from the Store".
Search for "Grammarly" and select the "Add" button to install the add-in.
Once the add-in is installed, you will see a "G" icon in the top right corner of your Word window. Click on this icon to open the Grammarly sidebar.
From the sidebar, you can review and make changes to your grammar and spelling. The add-in will also provide suggestions for improving your writing style.
I hope this helps!