Hi! You can include this in the Optional Details (prompt) field of your signup. There is no way to match on it, though, so I would recommend doing so if you would also be interested in a version of the character that is not (explicitly) trans.
(This is true of any detail that isn't a tag you can match on - if another participant is only interested in modern AU, or only in f!character who crossdresses to live the male life their canon version lives, they might end up matching to someone who shares that interest, but they might also end up disappointed if that particular prompt is the only execution of that swap that would make them happy.)
Ultimately, and I hope this doesn't sound like a cop-out, the choice of freeform depends on what sort of stories you would be interested in, whether or not the character gets written as explicitly trans. If you're looking for a story where the character has identified as a different gender from canon since they were young, Always would be better, but would not necessarily touch on the idea of them changing their sex or gender presentation. If you specifically want to read about a character's sex or gender presentation changing, Permanently is a tag that means that this change occurs within the story (typically via magic or weird science) after they've lived their canon life up to a point, but does not prescribe how the character feels about it before or after it occurs.
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Date: 2020-06-04 06:04 am (UTC)(This is true of any detail that isn't a tag you can match on - if another participant is only interested in modern AU, or only in f!character who crossdresses to live the male life their canon version lives, they might end up matching to someone who shares that interest, but they might also end up disappointed if that particular prompt is the only execution of that swap that would make them happy.)
Ultimately, and I hope this doesn't sound like a cop-out, the choice of freeform depends on what sort of stories you would be interested in, whether or not the character gets written as explicitly trans. If you're looking for a story where the character has identified as a different gender from canon since they were young, Always would be better, but would not necessarily touch on the idea of them changing their sex or gender presentation. If you specifically want to read about a character's sex or gender presentation changing, Permanently is a tag that means that this change occurs within the story (typically via magic or weird science) after they've lived their canon life up to a point, but does not prescribe how the character feels about it before or after it occurs.
Does this help?