What you need to do is open Program.cs (I'm assuming that you are using c#).
It should look something like this:
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace Music
{
static class Program
{
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Form1());
}
}
}
Changing the line I pointed out to
Application.Run(new Form2());
should do the trick.
Hopefully you understand why? :-)