Seeing and editing note data on Elektrons is more of a physical process than working with DAW piano-roll views and hardware sequencer event lists.
Get into step record mode as AdamJay suggests then select notes for editing (the lit ones are your sequence) by pressing the relevant trig button, using the scale button to cycle between pages, continue holding that button and select amp/filter/note page etc then turn the relevant encoder(s) to the desired value.
It may feel alien initially but it really is a beautiful, intuitive, system which you’ll be flying around in no time.