Storing data in the table containing autonumber field

I am using following query:
PreparedStatement statement2 = con.prepareStatement("Insert into register values ( ? , ? , ?,10 , ?)");
     statement2.setString(1, username);
     statement2.setString(2, userid);
     statement2.setString(3, Date);
     statement2.setString(4,email);
     statement2.executeUpdate();
Its working fine but next time I have to use some other value instead of 10 b/c this field is a primary key & its a autonumber. I want that table should take care of it on its own otherwise i wont be able to take benefit from this autonumber field. If I dont write anything then i get incompatibility error.
Can somebody plz. help me in this regard?
Zulfi.

sorry
just ignore the autonumber field
PreparedStatement statement2 = con.prepareStatement("Insert into register (\"username\",\"userid\",\"Date\",\"email\") values ( ? , ? , ? , ?)");
PreparedStatement statement2 = con.prepareStatement("Insert into register values ( ? , ? , ?,10 , ?)");
statement2.setString(1, username);
statement2.setString(2, userid);
statement2.setString(3, Date);
statement2.setString(4,email);
statement2.executeUpdate();

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