badark, Welcome to PinStack.
A question first, Do you have a BlackBerry data plan properly activated on your accout?
If so, Go to the Messages App and from the Menu select Compost PIN.
Either enter the PIN of the recipient in the TO: field or start typing a name of the contact that you want to send the PIN to, Once you have found the name, Just continue just like creating an email. Make sure the the entry for the contact has the correct PIN in the PIN Field.