My battery is dead and my lock on the trunk is broken, how do i jump my battery?

What is your question?

My bmw got wet inside from the rain,because there are 2 cracks in the windshield seal. Then my car battery would not start. Can not get in the trunk because the lock is broken. How do i jump my bmw?

What makes this problem better or worse?

The rain, my car has been getting really wet inside from the rain, then lost all power

How long has your 1999 BMW 323i had this problem?

months