Unable to call form from in vb.net

I have implemented interface in VB.NET! The class implements the interface!

Public Class Registro
Implements iDal(Of Registers)

'code to call form
End Class

This interface:

iDal.vb:

Public Interface iDal(Of T)
    Inherits iDisposable
    Function Insert(Model As T) As T
End Interface

My question is how to call form from this class?