Honda HS928 Owner's Manual page 32

OPERATION
6.Squeeze the drive clutch lever to self-propel the snowblower.
If the transmission release lever (see page 22) is in the ENGAGED
position, and the shift lever (see page 29) is in the FORWARD (F)
position, the hydrostatic drive will propel the snowblower forward
when you squeeze the drive clutch lever.
When both levers are squeezed, the drive clutch lever locks the
auger clutch lever down. This frees your right hand to operate the
other snowblower controls. Releasing the drive clutch lever unlocks
and releases the auger clutch lever.
To move from one place to another, or to change direction, use the
drive clutch lever only. Release both the drive clutch lever and auger
clutch lever, and then squeeze the drive clutch lever.
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DRIVE CLUTCH LEVER
DRIVE CLUTCH LEVER