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Jordan,

For your scope there should be a big knob just to the right of the screen.
Just above the knob it will be marked A and B, Time/Div, and Delay Time. You
should have a clear skirt on the knob with two black lines radiating from
the center. The value (number) that is between those two black marks is the
current time per division. setting of the timebase.

I suggested 5 ms only because there were three dark lines in the trace, and
at that time base setting that would be just enough time for approximately
three cycles of 60 Hz across the screen.

George