To connect your Google Ads account go to "Setup" -> "Advertising Setup" -> "Google Ads." For further instructions on connecting to Google Ads, go to this article: How do I connect to my Google Ads account?
Steps to check your connection to Google Ads:
There are two ways to know if you've connected to Google Ads correctly:
You should see "Connected" next to the Google Ads account you selected in the "Setup" area
You can also check your connect is correct by going to your account "Overview" page. Then scroll down to "Domain Summary" and look for red warning indicators adjacent to the domain name you'd like to check. If connected correctly your visitor data will appear and the red indicators will be removed. If they persist, then please recheck your connection or contact us (see screenshot below).
Screenshot of indicators: