Cursor gating an RMS measurement on MDO3000 series

I'd like to understand how I can obtain the RMS value between cursor A and cursor B on my MDO3024.

If you are using the RMS measurement, you can gate the measurement to be between the cursors. To do this, push the button for More in the Measurement menu. Push this button until Gating is highlighted and then use the side-menu buttons to select Between Cursors.