The standard way to find an actor is to basically go through all actors of a certain class using the actor iterator until you find the one you want:
From the wiki:
void AYourControllerClass::PrintAllStaticMeshActorsLocations()
{
//EngineUtils.h
for (TActorIterator<AStaticMeshActor> ActorItr(GetWorld()); ActorItr; ++ActorItr)
{
ClientMessage(ActorItr->GetName());
ClientMessage(ActorItr->GetActorLocation().ToString());
}
}
Just replace AStaticMeshActor with your custom class.