First, head over to https://app.datatrics.com/integrations/ and search for Hellodialog.
Click on the "Install" button, and you will be redirected to the settings screen.
In the input box "API key" fill in the API key you can find and create in Hellodialog > Settings > API. Then, please select the applicable language.
Datatrics will use the Hellodialog integration to sync profiles, known segments and add dynamic images to your e-mails.