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Multiple ways to skin a cat here & it's intimidating some times.
Easiest way is to click on the icon in the "quick reply" panel that looks like a postcard of mountains & follow the instructions on the screen.
You can click on the "go advanced" button & open another screen that allows you to go and select other files to attach to posts.
You can also click on "user cp" on the left of the blue bar at top of page...
At your "user control panel" that opens, look to the left for "pictures & albums" and create an album from which you can copy & paste pic files into a thread from the "share" bar that opens once you have pics in the album.
Others can give you other ways. Good luck with your truck & posting.