With your Z axis rod and mount removed from One side of your build plate you can either follow our Greasing the Bearings Guide before reinstalling your rod in Part X of this guide or you can continue this guide to remove and replace your bearing
With an Allen wrench remove the four (4) bolts that attach the bearing to the Build Plate, as indicated by the red arrow in the second image
Next, pull your bearing out of the build plate, notice how this bearing has a wider square end, which you unbolted
Now that you have your bearing removed you simply the insert the same bearing or a new bearing into the same location
Insert a new line below
Insert a new line above
Indent current line
Unindent current line
Delete current line
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