Can comeone fix this errors for me? I am new in scripting

namespace Balkan_Elite_Launcher_BETA
{
    public partial class Form1 : Form
    }
        public Form1()
        {
            InitializeComponent();
        }

        private void Start_Click(object sender, EventArgs e)
        {
             private void Form1_Load(object sender, EventArgs e)
        {
        string myRegistryKey = Registry.CurrentUser.OpenSubKey(@"Software\\SAMP").GetValue("gta_sa_exe").ToString();
        myRegistryKey = myRegistryKey.Substring(0, myRegistryKey.LastIndexOf(@"\") + 1);
        label1.Text = myRegistryKey + "samp.exe";
        textBox1.Text = Registry.CurrentUser.OpenSubKey(@"Software\SAMP", true).GetValue("PlayerName").ToString();
        if (!File.Exists(myRegistryKey + "gta_sa.exe"))
        {
            MessageBox.Show("Nije moguce pronaci GTA.exe u GTA folderu!\n" + myRegistryKey + "\nPorvjerite da li ste odabrali pravi folder, ako jeste pokusajte ponovno instalirati GTA SA.", "Greska", MessageBoxButtons.OK, MessageBoxIcon.Hand);
            base.Close();
            Application.Exit();
        }
        else if (!File.Exists(myRegistryKey + "samp.exe"))
        {
            MessageBox.Show("Nije moguce pronaci samp.exe u GTA folderu:\n" + myRegistryKey + "\nPokusajte ponovno instalirati samp ili Balkan Elite Launcher.", "Greska", MessageBoxButtons.OK, MessageBoxIcon.Hand);
            base.Close();
            Application.Exit();
        }
    }
 
    private void Pokreni_Click(object sender, EventArgs e)
    {
        string ServerIP = "188.165.40.163:7777 ";
        string SPHash = "NbGWjfVeFdkDzjCym67lRw=="; //Tu pisete pw za svoj server
        string GTAPath = Registry.CurrentUser.OpenSubKey(@"Software\\SAMP").GetValue("gta_sa_exe").ToString();
        GTAPath = GTAPath.Substring(0, GTAPath.LastIndexOf(@"\") + 1);
        else
        {
            Registry.CurrentUser.OpenSubKey(@"Software\SAMP", true).SetValue("PlayerName", textBox1.Text);
            Process.Start(GTAPath + "samp.exe", ServerIP + SPHash);
        }
    }
        }