To export a contact group, first navigate to the “Contacts” tab in your account:

Next, click the ☰ menu icon in the upper right-hand corner and choose “Export”: 

You will be asked which group(s) you’d like to export. Simply click the text field and choose the group(s) from the dropdown menu:

Once you click on the group(s) you’d like to export, click the “Start Export” button:

You should see a message indicating that an email has been sent to the email address that you’ve assigned to your account: 

Check your inbox to download the Excel file of your contacts export.