OK, that looks a bit rough, but maybe it will work.
Start by going to the SEC/DiV knob, push in the small CAL knob on the end and then turn the CAL knob all the way to the right. I can't see where the SEC/DIV indicator is at, so click it all the way clockwise, then ten clicks counterclockwise--that should get us in the ballpark. Flip all of the trigger switches (just above the EXT TRIG connector) all the way up and then find the PP AUTO button above that and push it in. Change the MODE switch to ALT, then rotate the VOLTS/DIV selectors all the way counterclockwise, then select GND on the coupling switches below. Lastly find the INTENSITY knobs (concentric) and turn each of them all the way down (counterclockwise) and then back up again. Do this several times if you don't see anything. Then report back with a new picture.