Unique virtual users for HTTP load testing

I am new to test complete and i am trying to load test with 5 users. Our application will not allow multiple logins,so i want to set up load test with 5 different user id's.I have created a test with one virtual user and it runs fine with out errors. Next i want to run load test with 5 different user id's.How do i pass 5 user id's and passwords to the test so that i can run test concurrently?