SpaceClaim is integrated with the ANSYS Student and ANSYS AIM software for meshing, applying forces and supports then calculating deformations and stresses. You get all that when you install ANSYS Student 18.2 or ANSYS AIM 18.2. Both are available free on that blue button near the top right of this page. ANSYS AIM is the easier product to start learning analysis if you have no prior experience with ANSYS Mechanical.
After you have AIM installed, you would Start a Static Structural analysis and it will present choices for geometry. You will select Define new geometry, then SpaceClaim will start and you can open the STL file with the options I showed above.
You are navigating away from the AIS Discovery experience