Ok, try these two threads.  This has been hashed out before on the forum.  One of the threads (http://www.rcuniverse.com/forum/m_73...tm.htm#7312398) is for installation of fire buttons (a nice addition).  The other (http://www.rcuniverse.com/forum/m_7301841/tm.htm) is for setting up your sticks to fire the MG and Cannon.  Let us know how it goes.