Be careful... I had a guest who tried using mapquest, which sent them off somewhere else. Mapquest doesn't really do to well with Disney addresses.
My advice would be to take 417 to the Osceola Parkway... follow the signs for Disney and the Wide World of Sports, and you'll quickly see Pop Century and entrance signs for Pop as soon as you pass under the arch.
Be advised this route will be the quickest (25 minutes, on average), but will run $2.25 in tolls. One toll booth is not manned, so make sure to have loose change.