pop it off, and put a new one in
You remove the wheel from axle then remove any clip holding the bearing and pop the entire bearing ( outer and inner race) out of the wheel. Take this bearing to a skate or bike shop to get an exact duplicate, or even to an industrial bearing shop to get abetter one.
The Best Brand for a roller skating boot is Riedells which range from $200- way more. Two bearings go into each wheel. With only one bearing your wheel would be really loose. I know because I figure skate on roller skates at the florham park roller rink.
wheel and axle
you need an Allen wrench(s) or screw driver(s) to take the screws out, then you need a bearing pusher tool that can take out the bearings to put them on the new wheel there are many tools to do that i suggest the kryptonics one tool because it has the parts to do all of that
Because in most cases they are a tapered roller bearing.
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It is not known who specifically invented the roller ball bearing. There are examples of their use by the ancient Egyptians. However, it is thought that they may have been invented before the wheel.