Memory cue points!!

Could somebody please tell me how to set memory cue points on Rekordbox? Not hot cues, just little markers so one can see where the breaks/drops/vocals start/end etc...I am sure it is very easy but I can see "memory cue" written and two arrows either side of a "call" button, but I can't for the life of me figure out how to do it.

I am a recent convert having switched from Serato (not by choice - my wife bought me the new set-up) and it's all very unfamiliar. One thing I do know is that setting those handy cues is not simple. I hit ctrl-p and set one by accident but now I can't get rid of it! Please tell me it's simple, because it should be...