How to change MDO3034/TDP1500 default display from dBm

I have a question regarding examining differential signals with my MDO3034/TDP1500. When I try to view these signals, the results only display in dBm, which is not what I want when attempting to view signals, and I am wondering if this is because I am in spectrum analyzer mode or if I have the scope setup incorrectly.

When using the RF input on the MDO3k the units default to dBm. You can change this to one of several other units by pressing Ampl in RF section of the front panel. Then select the vertical units and adjust using the multipurpose knobs.