"e" command? Never heard of it.
Well, I first thought they might have been talking about the Editor included with PC-DOS, called "e"... but reading the rest of their posts, particularly a reference to the debug command, makes me think that they are referring to an e command in debug. I don't have access to MS-DOS debug (I'm on my linux laptop right now) and I can't recall what the e command does.
What I don't like is they've not mentioned anything they tried; this reads, to me, that they didn't try at all. And if it's due tomorrow, presumably it was assigned some time ago and this is a last minute "Maybe if I post on a forum people will be so inclined to help me I won't have to do anything at all!" thing. I could be wrong, of course.
Far more worrying to me is that anybody would try to teach using the MS-DOS Debug command, particularly when there are far better assemblers available. That would be like a modern software engineering course using the original implementation of FORTRAN.