Move character with child joints.

Hello all. I am trying to apply a force to a character to move him (to the left for ex.). The character has a skeleton with rigid bodies on them and character joints. I've connected all the joints of the children to their parent rigidbody, but I am having trouble understanding how to set up my main rigidbody to apply force. Beside the rigidbody on the top level of the skeleton, the top-most bone is the pelvis, and I can't move the character by applying a force to the pelvis.

Any help is appreciated.