Proceed as follows:
You will notice the values in the System Properties in Property Editor window (bottom left) are not editable since the model is write-protected. When you click on a model instance in the Model Editor Window, the Instance Properties tab is activated in the Property Editor window with all parameter values being grayed out. It is possible to run the simulation here with the default settings. We want to change some parameters so you need to copy the system to a user library where you have write permission. The ﬁrst step is to create a top level user library as a container to hold your work.