Newsletter 
Connect Mailchimp 
- Go to Mailchimp and create an account. 
- Create a new list in Mailchimp https://us20.admin.mailchimp.com/lists.  
- Go to Account -> Extras -> API keys https://us20.admin.mailchimp.com/account/api/.  
- Copy API key and paste to Admin -> Settings -> Newsletter -> Mailchimp API key.  
- Copy List ID and paste to Admin -> Settings -> Newsletter -> Mailchimp List ID, then click Save. Or just click Save setting, and it will auto get List ID.  
