Apply structural loads to your analytical model to assess possible deformations and stress in your design.
You can apply point, line, and area loads to your analytical model. Click Analyze tab
Analytical Model panel
(Loads) to access the load tools.
Analytical Model panel (Loads) to access the load tools. - Click Modify | Place Loads tabLoads panel
(Point Load) 
(Line Load) - (Area Load)
(Hosted Point Load) 
(Hosted Line Load) 
(Hosted Area Load)
Each of these six load geometries is a family that contain instance and type parameters. You can edit load force and moment parameters before or after placing loads. Loads can be modified in magnitude and in case. You can also apply load combinations to your model.