The Emma add-on needs to be installed and activated to see the features mentioned in this this documentation.
Setup Emma
Login to your Emma account. Choose Account Settings, then select the API Key tab, and Copy your Public API Key, Private API Key and Account ID.
Go to Ninja Forms > Settings then find Emma settings area and paste the Public API Key, Private API Key and Account ID into the fields provided.
Adding an Emma action to your form
To add the action to any form, from the Emails & Actions tab click Add New Action and then the Emma action from inside the Actions Window that opens.
Configuring your Emma action
Click on the new Emma action in your Emails & Actions tab, and choose the Emma list you would like the user subscribed to.
Note: You may need to refresh the list. To do this, click the icon beside the “List” label.
With your list selected, the fields from your Emma list will populate below the list dropdown. You’ll need to map these fields to the corresponding fields on your Ninja Form using the merge tags for those fields via the merge tag icon on the right of each Emma field.
Adding an Emma Opt-in field to your form
The Emma Opt-in field gives the user an option to choose if they want to be added to an Emma list.
To add an Emma Opt-in field to your form, click on the blue add field button, then choose the Emma Opt-in.
If the Opt-in is unchecked, the Emma Action will be ignored.