This summary is not the rule. The rule text controls.
If someone files an appeal in a civil case that has no real legal merit, the appeals court can punish them for wasting everyone's time. The court can do this on its own, or the other side can ask for it through a motion.
The punishment can include making the person who filed the frivolous appeal pay money damages to the other side. The court can also make them pay the regular court costs, or even double those costs. This rule exists to stop people from filing appeals just to delay a case or annoy the other side when there's no good legal reason to appeal in the first place.
If you're thinking about appealing a civil case, this rule is a good reason to make sure your appeal has real legal grounds. Filing an appeal just to buy time or frustrate the other party can end up costing you more money in the long run.