Let's list out the steps in sequence:

1. Create the list inside Imnica Mail into which you would like to import your leads.
2. Create all the required custom fields for the fields you want imported.
3. Go to support, and open a new ticket.
4. Select > Imnica Mail - List Imports
5. Click the next button
6. Fill in all the fields
7. Attach the CSV export of your list to the new ticket
8. Submit the new ticket

Please follow the above steps for each list you would like to import.

List imports will be done in no more than 48 hours.