Anywhere you see the Export button, you will be able to send a csv list of your contacts via email:
For example, you can export all of your contacts by going to your account name>contacts by selecting the export button there.
Exporting Contacts from a List:
By going to the Lists tab, you can select what specific list you would like to export. Click on the three dot button of that list, and then click on the export button. The CSV will be sent to the email you select it to send to.