How do you fly a blimp?

A blimp is controlled using a set of rudder pedals and a pair of wheels situated on either side of the pilots seat (like a wheel-chair).

The rudder pedals are used to control the blimp on the yaw-axis. While the two control wheels operate the "elevrons" on the horizontal stabilizers. The elevrons are so-called because the serve the purpose of elevators (controlling pitch) as well as that of the ailerons (controlling roll). The pilot pushes the wheel forward for downward deflection of the control surface & pulls the wheel back for upward deflection, turning the wheels in opposite directions will cause the control surfaces to deflect in opposite directions, initiating a roll.

Blimps control their bouyancy by either adjusting the amount of gas in the envelope or by dropping ballast. The pilot uses these controls in concert with adjustments to the thrust of the engines to control altitude.