PmodBT2 can't understand this piece

Hi

i wanted to connect my android phone to adruino
i found out that i had this shield but it was not very well documented
PmodBT2
http://www.digilentinc.com/Data/Products/PMOD-BT2/PmodBT2_rm.pdf

i checked the pdf but no matter how many times i do i can't understand how to use the shield

the order of the pins was not clear their functions or the way to connect them to adruino is not either

i hope you can tell me how to connect it to adruino, i am kinda new