Merge replication using RMO with SQL Server 2008 Express

I am trying to configure a merge replication between a the publisher (SQL Server 2008 R2) and several clients running SQL 2008 R2 Express. I have created separate local windows logins for merge, distrubution and snapshot agents. Everything works fine if I use Sync Center on clients to replicate, but I cant get it to work when using RMO.

The problem is that I dont know how to connect with RMO using the dedicated merge account that Im using with Sync Center or a client that has the SQL Server Agent with the replication job.

Does anybody know best practice for this?

Here is a code snippet that I am using:

            ServerConnection conn = new ServerConnection(subscriberName);
            MergePullSubscription subscription;

                conn.Connect();

                subscription = new MergePullSubscription();
                subscription.ConnectionContext = conn;
                subscription.DatabaseName = subscriptionDbName;
                subscription.PublisherName = publisherName;
                subscription.PublicationDBName = publicationDbName;
                subscription.PublicationName = publicationName;

                if (subscription.LoadProperties())
                {
                    agent = subscription.SynchronizationAgent;

                    agent.PublisherSecurityMode = SecurityMode.Integrated;
                    agent.DistributorSecurityMode = SecurityMode.Integrated;
                    agent.Distributor = publisherName;

                    agent.OutputVerboseLevel = 4;
                    agent.Output = "C:\\TEMP\\mergeagent.log";

                    agent.Status += new AgentCore.StatusEventHandler(agent_Status);
                    agent.Synchronize();
                   
                }