Now you can either create a new email list or select the Email list link to upload email addresses in an existing email list.
Once you select a list or create a new list, you will be under Add Email Addresses. Here you can upload Email Addresses to the Email List. Enter in one Email Address per line and click Upload.
Can I upload additional variables?
According to the license level additional variables can be uploaded.
Under Add Email Addresses click on the custom data format and select the appropriate format.
Type in the Email Addresses along with the Variables separated by commas. Enter each Email Address on a new line and click on the Upload button.