how do i fix the linkage cable on the inside firewall?

What is your question?

The clutch pedal has no resistance. When I looked under at the inside firewall there is a broken plastic piece and a cable/rod that somehow is connected to the clutch. It won;t go into gear.

What makes this problem better or worse?

The clutch doesnt fully engage

How long has your 2005 Pontiac Sunfire had this problem?

a few days