1. From the campaign detail page, select Manage Members | Add Members - Import File. Subsequently, the Data Import Wizard appears.
2. Select Leads, then select Add new and update existing records.
3. Next, Set Match Leadby to Email.
4. Select 'Assign leads to campaigns'.
5. Select the CSV file that contains your import data, and then click Next.
6. Map column headers from your CSV file to these fields. Email, Company Last Name and First Name (optional but recommended)
7. Email
8. Company
9. Last Name
10. First Name (optional but recommended)
11. Click on Next.
12. Review the import settings, and then click on Start Import.