MPs can be run in a couple of different ways:
Use the Run MP Script Button opens a selection dialog to access an external file.
Alternatively you can right-click on an embedded MP and select Run.
MPs can also be run directly the MP editor which can be helpful for debugging a script.
When an MP is run, it does not run in the editor but opens within the MP Bar. The current status of the operation is then shown within the MP Bar:
The MP can either start automatically or wait in the MP Bar to be started. This behavior is controlled by a setting in on the Automation tab of the User Options.
The Green button starts the MP and will run it.
The Play / Pause button can be used to walk the MP through one step at a time.
Press the Done button to close the MP script. Note that the X on the MP Bar will not stop an MP operation, it will only hide the MP bar.