When you ordered a replacement baffle for this model of washer, you should have received a kit (part 285976). This kit will have a revised baffle with an installation screw and will allow you to replace the baffle without removing the drum.
Unplug the washer
to disconnect electrical power. Remove the top panel of the washer. Screws at the very back of the top panel secure it to the washer frame. Remove the screws and then pull the top slightly back and then up and off of the washer. Follow the directions in the image below to pull off the dispenser hose on the top of the washer tub and install a screw to secure the new baffle in the washer.