You always need a "Solver Configuration"-Block connected to your circuit/physical diagram (see below). In there you can make a few settings, but in most cases just using default values is sufficient. You can also make changes to the Solver in the Model Settings. But leaving the solver on "auto (Automatic solver selection)" works great in most cases. Hope this helps
Small tip: Please write a few sentences on your problem next time and provide error messages. Otherwise it is very hard to know what your actual problem is
