Yeah, you click on the player name in the pot history list on the table stats panel, which displays the HEM hand history window. At the top is a checkbox which marks the hand.
I always display table stats with the last 3 pots shown. Displaying the table VPIP/PFR is handy for ring play, I can review the last 3 pots easily without going through the replayer, and I can mark hands as needed. It's quite useful IMO.