Left rear tire is flat and not seated on the rim

as steve stated tube it but first find out why it went flat in the first place and fix it --

If the tire started coming apart it could have hit the brake dust cover and bent it.

Since the spare is mounted under the rear of the car, Its not easy...you have to assemble the long crank rod out of its two pieces, then feed the rod through the hole in the top of the rear bumper and lock it into the mechanism that holds the tire in place. Once the crank rod is locked in, lower the tire towards the ground. Once the tire is low enough, you can crawl under the car and release the tire from its mount. The hardest part is locking the crank rod into the spare tire mechanism through the hole in the bumper.

The bead of the tyre is tight on the rim, you need to apply force to the edge of the tyre close to the rim edge, use your weight stand on the edge with some good boots it will eventually give, the problem will then be re sealing it, your local car tyre shop may be the best bet.

2005 Honda Odyssey TOURING models originally came with Michelin PAX run-flats and eliminated the traditional dough-nut spare. If your van no longer has run-flats (look at the tire size) then your van has already been De-PAX'd...count your lucky stars because PAX tires run about 300 a tire plus!!! If you have been De-PAX'd then you will need a donut spare (T135/80D17) this goes into the spare tire space located behind the 3rd row of seats. this Site has everything you will need for the spare http://www.hondapartworld.com/1534_SPARE-SHJ

Call Dynacraft (bike maker) at 1-800-551-0032. My daughter's rear tire was flat and they sent out a new tube for free. She had the bike for only about 4 months. They also sent out a new rear tire as bearing/coaster brake assembly was make noises. The only problem is her original rim was purple and they sent out a silver colored rim as they don't have purple replacement part. I also had to install the tube and tire on the new rim. They only send replacement parts not assemblies.

wheel rim damaged ?? locating pin for wheel not lined up

INFLATE TIRE UNTIL YOU HEAR A POP THAT IS THE BEAD SEATING LOOK AROUND THE EDGE OF THE RIM ON BOTH SIDES MAKE SURE THEY ARE UNIFORM YOU MAY HEAR 2 POPS THAT WOULD BE ONE SIDE THEN THE OTHER

hello...is the tire loose but still on the rim...the sidewalls no longer engage the rim tight to hold air but still aroung the rim loose....If that's the case, get a jack, can of fix a flat, and a small ratcheting hold down strap.....jact the tire off the ground.....wrap the strap around the tire and ratchet it tight to get the beads of the tire to touch the rim....then commect the fix a flat or, if you have ,,,air from compressor to inflate the tire,,,,might have to work it a little to get the tire to reseat on the rim....this should work for you....once the tire is seated on the rim....stop inflating the tire until you remove the strap or you migh have a problem getting it to release from the tire if fully inflated....

did they replace the valve when the tire was replaced?
you could have the tire re-seated with some "bead sealer" if it is a minor leak at the rim
otherweise you would probobly need a new rim