You need to get underneath the car.

You will see two rods that consist of your shift linkage: the shifter rod (the one that moves) and a stabilizer rod (the one that is bolted to the side of the tranny). At the end of the stabilizer rod is the first bushing. Unbolt it from the tranny and pry that old bushing out. Then press the new one in with all your might just as the old one came out. Then rebolt and that bushing is done.

The other bushing is behind the shifter assembly where the two rods connect. Unbolt it from the underside of the car and remove it from the two rods. Place the new one in and rebolt it. That is the end of the bushing install.

Personally, I think the slopiness could be due to a loose connecting bolt between the shifter and the shifter rod. Check that first before you do anything.