Click on the extension icon, or go to 3 dots > Extensions
You should now see the extension. Pin it for access.
Open app.sendegg.com to access the same dashboard you can see in Gmail
Go to Gmail, you should see the egg logo on the left sidebar
Log in and click it to start using
Go to LinkedIn and open someone's profile
Click on the Egg Icon of the extension on your browser bar (next to the puzzle icon)
You should see the side sheet to add their contact to your dashboard with one click