How do I import my customers in to MailChimp?

1. Go to the Settings > Customers. 

2. At the bottom of the page fill out the MailChimp API key and the subscriber list ID. Then click Update details. 

3. Go to the Customers section at the top of the dashboard.

4. Select all your customers using the tick selector. Note: To tick all customers you may need to change the "Show__rows from" box at the top of the screen to 5000. 

5. Scroll down to the Actions drop-down box and choose the Import into MailChimp option and click Apply.