Once integrated you select what list to add registrants to at the event level within event integrations tab.
You may also see fields for unique url and replay url..
Those are only needed to fill in if you want the registrants links sent back along with name and email. Only if you plan to send reminders from your autoresponder..
You need to create custom fields within your autoresponder for each one as seen in images below.. Custom fields for unique event and or replay link is needed because that's how the system tracks if they showed and how much in percentage they watched..
You may also wish to use tagging too.
Create a list:
Create your tags:
Create your custom fields: