How do the fog lights adjust?

Is there a screw on the back of the housing where the bulb goes in?

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Current: '12 Audi S4 Quattro Prestige 6MT

Previous: '06 Audi S4 Quattro 6MT (for sale!)
'06 Chevy Cobalt SS, Stage II: 2.0L Supercharged, 16psi boost, G85 Package; Recaro Racing Seats, Limited Slip Differential, 5 Speed Manual
'00 Pontiac Bonneville SE ( 4 years, 197,000 miles)
'99 Dodge Intrepid ES (1 year, 2 engines)
'95 Chevy Lumina (2 years, 164,000 miles)

There is a plastic knob on the back for up and down adjustment. It often gets quite rusted, so you may have to spray it down well with some penetrating oil.

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*Gone, but not forgotten* - Black 2000 SSEi, HIR Headlights, Angel Eyes fogs, 3rd brake light overlay, hi-flo cat, 180 degree thermostat, HS 1.9 rockers, LSx yellow springs, Intense FWI, PCM, shift kit, push rods, and 3.4 Pulley. ZZP Power Log.