You can go to options and then status and it will show there, or anywhere you can type text, like a text message, email, bbm etc, you can type mypin then a space and it will appear.
Three ways that i know of is write mypin and press the spacebar and it will appear. Then hold alt caps and the letter H and a screen will pop up with all the info about your BB and the pin is there. Last but not least go to options and status and its in there as well.