Follow these steps to add a contact list:
Login into the dashboard and open Campaigns section.
Then:

✔ Click on Create Campaign
✔ Enter Name of your campaign
✔ Select the Assistant , that you want to use in this campaign
✔ Select the phone number, that will be used to contact your customers
✔ Select the contact list, the target audience
✔ Click on Save

👏👏 Congratulations, you have successfully created your First Campaign 🎉🎉