How do I remove the front seats from my 2007 chevrolet cobalt?

Push the front of the seat rearward and upward to release the seat

here

To do this you would have to remove a freeze out plug from the engine block

look on side cylinder block beside starter.you have to remove the starter to remove the crankshaft sensor.

There is a TSB on this issues if your having ignition lock issues.
Service Information
2009 Chevrolet Cobalt | Cobalt, G5 (VIN A) Service Manual | View All Bulletins | Document ID: 2325129
#09-02-35-005: Ignition Key Difficult to Remove, Ignition Key Binds or Sticks in Cylinder (Replace Ignition Cylinder) - (Aug 10, 2009)

Subject: Ignition Key Difficult to Remove, Ignition Key Binds or Sticks in Cylinder (Replace Ignition Cylinder)

Models: 2008-2009 Cadillac CTS (Built Prior to VIN Breakpoint 90163371)

2005-2009 Chevrolet Cobalt (Built Prior to April 14, 2009)

2006-2009 Chevrolet HHR (Built Prior to April 14, 2009)

2007-2009 Chevrolet Equinox (Built Prior to July 2008)

2005-2006 Pontiac Pursuit (Canada Only)

2006-2009 Pontiac Solstice (Built Prior to April 14, 2009)

2007-2009 Pontiac G5 (Built Prior to April 14, 2009), Torrent (Built Prior to July 2008)

Attention: This bulletin only applies to vehicle equipped with automatic transmission.

replace speakers or look for loose connection or is the fade adjustment turned to just the rear you would be suprised

are you trying to remove the cushion or the back rest?

Push the button and pull up on it at the same time

you have a bad left front wheel speed sensor. try putting a little die-electric grease in the connection

(The engineers couldn't have hid these much better if they tried...)

1) Open the trunk lid all the way.
2) Look up under the inside top edge of the trunk opening.
3) You will see two 1" wide x 1/2" thick, black plastic knobs, about 1' apart from each other.
4) Pull straight back on a knob to release one of the back seat halves.
5) Go forward to the back seat compartment and lay each released seat the rest of the way down.
6) Paint the buttons white so the next person can find them easier!