To integrate with Constant Contact, simply follow the steps below.
1. Go to "My Account > Autoresponders > Connect New Autoresponder" in your OL account.
2. Select Constant Contact from the drop-down menu for Autoresponder System.
3. Click on the button "Connect with Constant Contact". You will be directed to Constant Contact's permission page.
4. Put in your login details for your Constant Contact account. Then, click on the button "Allow Access".
5. Close the popup and refresh the 'My Account' page and you should see Constant Contact in the Autoresponders tab.