I found a simple solution without needs to write a new code from scratch (ofcoz it is best if you can).
I can add as many as I want by doing this:
Private Sub MainForm_Load(sender As Object, e As EventArgs) Handles MyBase.Load
AnimatingPictureBox1.Controls.Add(AnimatingPictureBox2)
AnimatingPictureBox2.Controls.Add(AnimatingPictureBox3)
AnimatingPictureBox3.Controls.Add(AnimatingPictureBox4)
End Sub
in order to do so, all sizes of AnimatingPictureBox must be the same as the GroupPanel.
Play around with the ImageRotationScale, ImageTranslateX and Y to position the image you want to show.