2/Form3.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace BB_Zdanovich
{
    public partial class Form3 : Form
    {
        public Form3()
        {
            InitializeComponent();
        }

        private void label4_Click(object sender, EventArgs e)
        {
            // Открытие form2 по нажатию на стрелочку
            Form2 f2 = new Form2();
            f2.Show();
        }
    }
}