This summary is not the rule. The rule text controls.
If a lawyer is representing someone in a case involving child abuse, neglect, or dependency, that lawyer needs to officially tell the court in writing that they're on the case. This is called filing an "entry of appearance." The only time a lawyer doesn't need to do this extra paperwork is if the court has already appointed them to the case, like when a judge names them as a guardian ad litem or as the child's lawyer.
Once a lawyer is officially on a case, they can't just walk away from it whenever they want. If they need to stop representing their client, they have to ask the court for permission first. They do this by filing a motion to withdraw, and a judge has to approve it before the lawyer is actually off the case.
This rule matters because it keeps track of who is legally responsible for representing each person in the case. It also protects clients from being suddenly left without a lawyer. As long as a case is open, everyone involved knows exactly who their attorney is unless the court says otherwise.