Can't seem to add plugins to DRCsim models

edit

I'm trying to add a bumper plugin to the drcsim atlas model so I tracked down the atlas.urdf file that is run by roslaunch drcsim_gazebo atlas.launchand added the following code for the r_foot link

<gazebo> <plugin name="${name}_gazebo_ros_bumper_controller" filename="libgazebo_ros_bumper.so"> <alwaysOn>true</alwaysOn> <updateRate>${update_rate}</updateRate> <bumperTopicName>${name}_bumper</bumperTopicName> <frameName>world</frameName> </plugin> <gazebo>

By my understanding this is supposed to create a topic called atlas_bumper but I don't see anything of that sort when I run rostopic list. I'm new to this, what am I doing wrong?

Thanks