Rapid speed is whatever velocity you have set in motor tuning for that axis, you can set a slow Jog speed as a percentage of that, press the Tab key on your keyboard and you will see a pop out window. If you set the Slow Jog you can over ride this when jogging by pressing the shift key at the same time as you are jogging.
Cutting speed is set by the F word in your code, for example if you are in G94 mode (mm/min or inch/min) then F100 will be the speed the axis goes at when doing G1,G2,G3 moves. G0 moves will be at rapid speed. If you are in G95 mode F100 would be 100mm per revolution so be careful
Hood