Models are grouped into three classes:
To visualize model in a different window, from menu click on Model.Select a type of model and then the name of your model.A new window will appear with the plot of your model with default values. Change model's parameters on model view tab and view the plotted model with its new parameters.
Write your own model plugin and save it into plugins directory. You plugin model will be added into "<>added Models" fiel on model menu. then you can use it as a regular default model.