Where is filler plug on 2010 Jeep Wrangler auto transmission?

There's no filler plug on a 2010 Jeep Wrangler's automatic transmission. Automatic transmissions on these vehicles are sealed units and require the transmission fluid to be changed by a professional using specialized equipment that pumps out the old fluid and replaces it with new. There isn't a simple "add fluid" method like you'd find in some older vehicles with dipsticks.