You can set rigid body attributes before or after you create the rigid body.
To set rigid body options before you create the emitter
The same options window is displayed for both menu selections.
To edit attributes after you create the rigid body
To select the rigid body in the workspace, select the x-shaped icon that exists near the surface. To select the rigid body in the Outliner, select Display > Shapes in the Outliner, open the surface node, and select the indented rigid body node.