Connecting bluetooth to Lilypad Arduino
Without knowing which BT module you are using it will be a little difficult to help, but. As mentioned above using the BlueSMiRF board and some jumper wires you can attach


5v to PWR
(-) to GND
tx to RX - I 
rx to TX - O


If you have a specific BT module you are working with update your question and we can try to be more helpful.