Security accounts, logins, and passwords required by replication are supplied when replication is configured and when publications and subscriptions are created. These security settings can be changed later using SQL Server Management Studio, replication stored procedures, and Replication Management Objects (RMO). The following topics describe how to modify replication security settings.
Other Resources
Security and Protection (Replication)
Managing Logins and Passwords in Replication
Help and Information
Getting SQL Server 2008 Assistance