Step 1: Go to themain menu and click on "Extensions" in the Admin Tools section.
Step 2: If you have a zip archive, upload it to Typo3.
If you don’t have a zip archive, you can get the extension directly from the Typo3 Extension manager.
Either you download or upload the extension, Typo3 will automatically install it. The CleverReach® extension appears on the list of your installed extensions. You can access it via your main menu.
Step 3: To configure CleverReach®, go to the list of your installed extensions and click on the "Configure" icon.
To synchronize your existing frontend users as subscribers, please check 'syncUsersAsSubscribers'.