[aparent]

Both ends of the experiment share entangled photons produced from a single source and sent both ways. The sender performs some operations and measurements on their two photons, i.e. the photon they wish to send, and their entangled photon. They then send the result of the measurements to the receiver (this can be done any normal way you can think of; for example over a classical network).

The receiver does some operation on their entangled photon based on the results of the senders measurements. After these operations their entangled photon will be in the exact same state as the sent photon.

So to answer your question, information is transmitted classically but that information would not be enough without the use of entanglement.