Males should develop a 'sword' on their tails as they mature. Females do not have that.
Both of these pictures will show you how to distinguish both sexes. This is applicable to all well-known livebearers (i.e. platies, swordtails, mollies, guppies).
Male
-Pointed fin near the anus is actually a gonopodium which is inserted in the female's vent to deposit sperm.
Female
Fin near the anus is triangular in shape.
Just a warning. Livebearers have a tendency to produce several dozens of fry in a few months so unless you can cope with that lot, chances are you'll have to leave nature to take its course and have most of the fry be eaten to their fellow tankmates. A female can produce several batches of fry in a single mating with a male.
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