The instructions for balancing the plane are located on page 44 of the manual. [link]http://www.hangar-9.com/ProdInfo/Files/han1600-manual.pdf[/link]
An important part of preparing the aircraft for flight is properly
balancing the model. Don’t inadvertently neglect this step. The
recommended C.G.(Center of Gravity) location for the first flights
with the Cessna is 3 5/8" from the leading edge of the wing.
If necessary, add weight to either the tail or nose until the correct
balance is achieved. Stick-on weights are available at your local
hobby shop and work well for this purpose.