To install the Google Docs extension, visit the Red Marker for Google Docs page in the Google Chrome Web Store.
Press 'Add to Chrome' and follow the prompts to ensure the extension is added to your Google Chrome browser.
Next time you're in Google Docs, you'll be able to use the extension to review your marketing material. You can learn more about how to use our Google Docs extension in our support article Google Docs: How do I review my document.