Crystal Reports A question about Parameters that's a little messy

Message

   I have 1 question that'll require multiple answers (I think), because I'm pretty lost on what to do. I'm using Visual Studio 2008 and crystal reports 10 (vb.net web application).

What I am trying to do is check the user who's logged in (I'm using .net users and roles)  and assign it as a parameter to a formula in my report. But I also have three parameters that I want the user to input.

Here's my code behind:

Partial Public Class reportstatus
    Inherits System.Web.UI.Page
    Dim myReport As New CrystalDecisions.CrystalReports.Engine.ReportDocument

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        configureCRYSTALREPORT()
        myReport.SetParameterValue("UserName", User.Identity)
    End Sub
    Private Sub configureCRYSTALREPORT()
        Dim myConnectionInfo As New ConnectionInfo()
        myConnectionInfo.DatabaseName = "CSi"
        myConnectionInfo.UserID = "*****"
        myConnectionInfo.Password = "*****"
        setDBLOGONforREPORT(myConnectionInfo)
    End Sub
    Private Sub setDBLOGONforREPORT(ByVal myconnectioninfo As ConnectionInfo)
        Dim mytableloginfos As New TableLogOnInfos()
        mytableloginfos = CrystalReportViewer1.LogOnInfo
        For Each myTableLogOnInfo As TableLogOnInfo In mytableloginfos
            myTableLogOnInfo.ConnectionInfo = myconnectioninfo
        Next
    End Sub

And here's my forumal I'm trying to get to work on my Crystal report:

{tblTireJobs.Status} = {?Status} AND {tblTireJobs.DateReported} >= {?StartDate} AND
{tblTireJobs.DateReported} <= {?EndDate} AND {aspnet_Users.UserId} = {?UserName}

Obviously when it asks for parameters it asks for all 4, including {?UserName}, which I don't want. I want it to take the value from my SetParameter value. 

sorry if this is a mess.