How do you tell if your BPs a male or female

[Porthos the BP]

Hey guys just so you know those little pictures that people post that look like pictures, that are links to other pictures. Like the one in the post above me. well I can't go to the link. I can't click on them. and also I was wondering about how much it would cost if I set up my tank like with the link you just showed me.follow this tutorial