Simple Load Study

I'm new to simulation, so this may be an elementary question...

I'm trying to so a simple static load study on a structural framework. I tried using the "Study Advisor" to guide me through the setup, but I can't seem to apply a load to the structure - am I missing something? I get to the "Force/Torque" dialog, pick my faces, input the force value, and I'm answered with the wonderfully descriptive error "Load/Restrain cannot be applied to the beam face edge or vertex."

What am I doing wrong?

Thanks in advance for any help!

-J

SolidworksSimulation