How do pilots steer them?

Generally speaking, they don't. A balloon drifts in
the same direction and at the same speed as the
wind. The skill is for the pilot to pick the altitude that
has the most desired wind direction. Surface winds
sometimes blow in a very different direction from the
winds aloft. Altitude control is achieved with the
on-board burner. Longer "burns" will achieve lift.
Shorter "burns", or none at all will allow the air to
cool, and the balloon to descend.

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