Can anyone tell me hoe to r & r the rear wiper blade. I asked at the dealer and they told me I could pay them to install it!

It's not rocket science. Get a replacement one anywhere, they come w/basic instructions.

The rear wiper for 4Runners 2003 and newer is Toyota specific (at this time); don't fret about the price--it's no more than most name brand wipers. With your index fingers, gently slide off the plastic covering where the wiper connects to the lift gate; this will allow the wiper to swing away from the window. Now turn the wiper out towards you so that it's facing you instead of the window; there will be some initial resistance as you pop the wiper out of it's locked position--this is normal. The rest of the disassembly will be obvious--gently pull the old wiper blade out of the pin that locks it in place on the wiper arm. Reinstall the new blade.