To integrate DoTimely to your MailChimp Account. Go to Settings
In the Settings Page Select Integrations
Click on Connect to MailChimp button
Enter your MailChimp credentials to authorize the integration. Please note you will have to create an account for MailChimp first.
Click on approve to connect the accounts.
Now you can either go to customer list or staff list to export the list into MailChimp from DoTimely. Just click on the MailChimp logo to export as shown in the picture below.