Start out slowly. Put your blue parakeet in its cage. Then put your new parakeet outside of the cage. Let them get to know each other. When you think they are getting along you can put them together in the cage. When they are in the same cage give them some millet (or an other treat you have).

Hope this helped!!!

Just put them in the same cage and have them learn to like each other.

I was wondering how to introduce a new green parakeet [female] to my currently owned blue parakeet [female] .Please don't suggest putting two cages together i don't have enough money thanks in advance