how do i replace rear wheel bearings?

Rears are fairly easy. Remove the caliper and rotor. Remove the center cap and nut. I believe it is a 30mm nut. Remove the hub assembly and install the new one

Roy I attached the procedure for you to remove the wheel bearings.

https://www.2carpros.com/articles/bearing-hub-replacement

You will need a press to remove the bearing once you remove the hub itself.

https://www.2carpros.com/articles/bearing-press-how-to-use

Roy