First register on zapier.com or login to your account.
Click "Make a Zap" and find youengage app.

When you start creating a youengage zap, you will be asked to connect your youengage account. Next, you'll be asked to enter your 4screens credentials

Type your youengage credential into your Zapier account and then “Continue”.

If all steps were successful your youengage account will now be successfully connected. Next, you can choose your project as a trigger and continue to set up your zap.