Step 1: Open a Google Sheet project
Step 2: In Google Sheets, click the Add-ons pull-down menu and select Get Add-ons.
Step 3: Search for Yet Another Mail Merge. Click the Free button next to the add-on.
Step 4: A pop-up window will launch containing the Authorization screen. (Based on your browser’s configurations, you may need to permit pop-up windows.)
Step 5: Click the Allow button, located at the bottom of this pop-up window.
Step 6: Yet Another Mail Merge will be installed at this point and will offer you the opportunity to import your contacts information into the current sheet. Importing Contacts is not necessary; choose: “Add emails myself”
Step 7: You have now successfully installed YAMM, for instructions on how use this add-on please see our Using YAMM (Yet Another Mail Merge) solution