Next, we will apply fixed boundary conditions to the two nodes at the bottom of the model.
- Ensure that the
View 
Navigate Orientation Front View is displayed. - With the
Selection Shape Point or Rectangle and 
Selection Select Vertices commands active, click and drag to draw a box enclosing the bottom of the model as shown in the following image. Ensure that only the bottommost two nodes are selected. 
- Click
Setup Constraints General Constraint. - Click the Fixed button.
- Click OK.