switching from login to main form.

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Delphi

I am trying to move from a login screen to the main form. i need my login to come up first before the main form , and there after a succesful username and password logon the login form must disappear.currrently i am using

form2.show;

and

form1.hide;

i know this wrong , but i dont know what is the correct way to move from a login screen to a mainform. please see below my code from login screen. please dont mind my components naming

IBQuery1.SQL.clear;
        IBQuery1.SQL.add('Select * from USER_ACCESS where USERID = '+ edit1.Text+'') ;
        IBQuery1.Active := true;
        UserId := IBQuery1.FieldByname('USERID').AsInteger;
        pasword:= IBQuery1.Fieldbyname('PASWORD').AsString;
        name1 := IBQuery1.fieldbyname('NAME').AsString;
        privilege := IBQuery1.fieldbyname('USERTYPE').AsString;

                if((UserId = StrToInt(edit1.Text)) And (pasword = edit2.Text))
         THEN

          begin
        ShowMessage('login Successful ' + name1);
    form2.Show;
   Form1.Hide;
        end

        else

        ShowMessage('Wrong Password');


end;