To see the PennyLane-Qiskit plugin in action, you can use any of the qubit based tutorials from the PennyLane documentation, for example the tutorial on qubit rotation, and simply replace 'default.qubit' with any of the available Qiskit devices, such as 'qiskit.aer':

dev = qml.device('qiskit.aer', wires=XXX)

You can also try to run tutorials, such as the qubit rotation tutorial, on actual quantum hardware by using the 'qiskit.ibmq' device.