The qrefresh command is only useful if you are using Mercurial Queues . You say that you are still a newbie to Hg, so I assume you did not. But yes, if you used queues, the current patch commit message can be edited using the following command:
hg qrefresh -e "new commit message"
Again, Mercurial Queues (or MQ) is an extended topic, and I would suggest you read it here.
MQ is powerful, but until you feel comfortable, HistEdit is a good way, as Macke said.
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