My ceiling fans came with clips and a small weight that you could attach to the top of the fan blade. I assume you have these. Place the weight on each fan blade, successively and spin the fan by hand. This way you should be able to tell which fan blade is in most out of balance. After you determine the fan blade to attach the weight, you adjust the weight along the blade (by trial and error) after allowing the fan blades to get up to operating speed (electrically). The further away from the motor housing, the greater effect, so start out with the weight close to the motor housing.