It's a very risky thing to do, and in most cases either the male will attack the females eventually, or the females will attack the male. Either way someone will get serious wounds that may cause death if not noticed soon enough. You should remove the male and give him his own aquarium, even if he's fine in there now eventually his instincts/hormones will kick in if the females haven't already destroyed him.
Only a select few very experienced betta keepers(usually breeders) have managed to keep a community of both male and female, and it's always in a huge heavily planted aquarium, with fish who where raised together from fry. They are able to understand betta behavior and body language in a way the average or new keeper can't see, which allows them to know if a fish should be removed.
If you don't have another tank for the male, try finding a breeding net, or breeding container you can put him in to protect your fish. It can't be a permanent home(he would probably destroy his fins in such a small space) but it will be ok until you are able to get him a heater and aquarium :)
You can get a net breeder for less then $10
and other fish breeders are usually $10-$15, but sometimes come with hoods to keep the fish from jumping out
Check out the eBook Betta Fish Care Made Easy
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