How do I one form register record and then another form2 in form 2 button on click then not open form if user not permission to access form in C#

i have a windows forms. 5 form first registration form, second login form ,third home form etc.... suppose In registration form  if user register  username operator&  password operator, checkbox 1(form1), checkbox2 (form2)  checked checkbox1(form1), not click form2  then save record.
& login(uername: admin , pass admin)
then  home screen was open in home screen button1(form1),button2(form2)  if i click button1(form1) then open form 1 , and button2(form2 ) not open button on click. admin user not permission access form2. & same as a different  user username: admin, pass: adminlogin then click both button access open form1, form2 on button click ?

This is windows application. Actually. Checkbox checked save record in mysql db. In db if checkbox checked save value yes. If yes in db then login user then home screen was open. In home screen button there if on button click then form open. If checked save value in db and if not permission unchecked save value ( no) then not open form

private void btnManual_Click(object sender, EventArgs e)
        {
           try
            {
               string ChechBoxName = "CH1";
                CheckBox chkManual = new CheckBox();
                chkManual.Name = ChechBoxName;
                chkManual.Checked = true;
                if (chkManual.Checked)
                {
                 frmManual manual = new frmManual();
                 manual.Show();
                }
              }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, "btnManual_Click,frmHome", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
}

private void btnAuto_Click(object sender, EventArgs e)
       {
           try
           {
               frmAuto auto = new frmAuto(); // source screen
           //    // frmAuto Auto = new frmAuto();   // Destination screen
           //    dal.change_screen2(auto);
           //}
           //catch (Exception ex)
           {
              MessageBox.Show(ex.Message, "btnAuto_Click, frmHome", MessageBoxButtons.OK, MessageBoxIcon.Error);
          }



      }