SwiftCRM uses a simple name-value pair system of importing leads.
This page has moved to http://swiftcrm.com/importleads
Please check that page.
Note: If you want to import a list of Aged leads, see http://swiftcrm.com/csv-import
If you are Switching to SwiftCRM from another CRM, or another contact package, see http://swiftcrm.com/switchtoswift