How Do I Call A Select Statement Properly When The Field Is A Yes/no?

Hello,

i am pretty new to asp. I am trying to do a select statement for sending an email to everyone who is not an admin. the code is below, i know it must be fairly simple, yet i do not know how to do it. With the code below, I select everyone. I want to know how to do it properly, similar to the second which does not work.

Dim cmd As New OleDbCommand("SELECT Username, Pass, Gender, FirstName, LastName, Email, NickName FROM tblUsers", conn)

DOES NOT WORK:

Dim cmd As New OleDbCommand("SELECT Username, Pass, Gender, FirstName, LastName, Email, NickName FROM tblUsers WHERE Admin = 'N'", conn)

Thanks in advance.