Need to install parts - GEH WD12X383 Could you please tell me how to do it? 
Margaret,
You may want to flip the rack assembly upside down, so you can see how the roller axel assembly is mounted and snaps on to one of the wrungs of the rack.
You may need to have a small screwdriver near by to use for spreading the clip, you can spread the clip open and turn the axel assembly so the whole roller assembly can slide off the metal axel shaft on the rack.
I’m sure you’ll get it done,