Click the Settings icon on the top-right corner of the screen.
Click Tracking under Email.
You will be able to track:
Email open tracking: Track who opened your email campaigns and how many times they were opened. Open tracking works by placing a tiny invisible image in the email. When the image is downloaded, the email is recorded as opened.
Email click tracking: Track how your contacts interact with the links in your email campaigns. This helps you see which links were clicked, how many times they were clicked, and who clicked them.
Email plain text tracking: Track link clicks in plain-text emails. To enable tracking, all links in the email are automatically replaced with tracking URLs. This allows you to measure engagement even when HTML emails are not used.