Click on the simulate tab in your ribbon (rainbow colored cube) and the simulation window will pop up. If you have any errors they will be displayed ...
Step 3: Constraints for your part
Defining constraints for your part is important in order for your analysis to perform correctly. If I have input forces pushing up on my part, but nothing constrained or held in place to hold the part down, there would be no stress to display. In this trial I am going to used a fixed constraint the center of my part, which is the middle red cylinder (simulation of steering stem shaft). This means that this area of my part will remain in place while the input forces are affecting my part. Use the constraints tools in the ribbon to define them on your part.
Now that this is complete we can move on to input forces.