Step 1: Go to the TMS URL: 

Step 2: Choose the correct account

Step 3: Click on the Campaign Manager menu item.

Step 4: Click on the Campaigns sub-menu item.

Step 5:  Click on “Manage” on an existing campaign.

Step 6: Scroll down to lists and click on “Add List”

Step 7: Give the list a name and decide on a target. Give the List a script or leave it on default to use the campaign script. 

Step 8: Drop the CSV list in the allocated space.

Step 9: Click apply to save the list.