Download the file ODESolver.opx, and then drag-and-drop onto the Origin workspace. An icon will appear in the Apps Gallery window.
Click the icon to open the dialog. Define the equation, integration interval and initial conditions. The tool provides three options for method: Runge-Kutta, Adams and BDF(Stiff).
Click the help button in the dialog to open the help file, which includes explanation of the dialog settings and two examples.