There's an article I wrote quite a long time ago that explains how to make macros (demos). I don't think you can record them in multiplayer, but you could try doing stuff with the command line options. There's some additional information in comments posted by people.
JJ2 will cycle through .j2m files in its folder, so you can rename all of them except yours to get it to play. I don't think there's any way to directly start specific macros.
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With our extreme gelatinous apology,
We beg to inform your Imperial Majesty,
Unto whom be dominion and power and glory,
There still remains that strange precipitate
Which has the quality to resist
Our oldest and most trusted catalyst.
It is a substance we cannot cremate
By temperatures known to our Laboratory.
~ E.J. Pratt
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