when you make a post, right above the "continue" button, check the box that says "I want to preview my post and/or attach a file "

then pick the pic to attach. you may have to resize it beforehand, IIRC the file size limit is ~500k

1976 Spinnaker White Plymouth Duster, /6 A833OD
1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!***
2011 Toxic Orange Dodge Charger R/T
2017 Grand Cherokee Overland
2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)