Im sorry for the late reply.
This is what i have done so far but i doubt it is correct
http://s7.postimg.org/smklfe5ob/IMG_20130607_WA0003.jpg
these are the relevant equations
http://s17.postimg.org/7iorc64pr/IMG_20130613_WA0001.jpg
To find the respective torque that is need to bend the the arm at 180 degrees, 90 degrees and 30 degrees. The arm is not holding anything.
Relevant equations and information
τ=rFsinθ
total arm weight =3.35kg
upper arm length =19cm
forearm length =28cm