You have to open the rear hatch like you would to replace the reg. brake lights. Screws should be accessible once hatch is fully open.
The GMT360 platform Trailblazer from 2002-2009 never had a tailgate only a rear hatch. www.trailvoy.com
need help changing the belts on my Chevy trailblazer lt 2003
How do you change the spark plugs on a 2002 chavy trailblazer
there is access panel you have to open
remove and replace engine coolant temperature(ect)/chevy 2004 trailblazer
Call someone
Seeing as your not that savvy.. take it to a 'lube shop let them change your oil
Remove fuel tank for access
see "how too replace water pump on 2002 Trailblazer"
try this website --->www.trailvoy.com<--- they have alot of stuff to help you with your trailblazer i should know im a member my self i have a 2003 Chevy trailblazer Lt www.trailvoy.com
www.trailvoy.com
buy a Honda or Toyota. Hope this helps