Constructor change if I wrong and auto generate field

Question

I want to change in constructor type od ,,izmeni,, I have Created form with name izmeni, but I am wrong and automaticly put izmeni new class...auto generate. I want to change to existing form ,,izmeni,, ...this colorised is problem...I want with izmjeniPrijavnicuButton_Click open existing form izmeni, but app open new empty form

 

private void izmjeniPrijavnicuButton_Click(object sender, EventArgs e)
       {
           if (prijava_radnikaDataGridView.SelectedRows.Count > 0)
           {
               izmeni dodaj = new izmeni(Convert.ToInt32(prijava_radnikaDataGridView.SelectedRows[0].Cells["dataGridViewTextBoxColumn1"].Value.ToString()));
           dodaj.Show();
           }
           else
           {
               MessageBox.Show("Selektujte prijavu za izmjenu!",
                                  "Greška",
                                  MessageBoxButtons.OK,
                                  MessageBoxIcon.Error,
                                  MessageBoxDefaultButton.Button1);
           }
   }