On the left panel, click on 'Address book' and click on "Create List". You can either give the list a name or use the generic name that Exotel generates.

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You'll find the newly created list in the table. Click on the list you'd like to add numbers to.

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Download the 'Sample CSV file'  and add the list of numbers to it in the prescribed format. The format of the csv is Name, Company, Phone, Email.

Name your list and upload your csv file and click 'Import'

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Now you'll see the newly created list in the 'Browse lists' section. Click on you list name to see all the numbers present in it.