You can not use quantum entanglement for communication.

If you have two entangled particles, and you measure spin of one of them, you'll randomly get a result 50% of the time that it is up, and 50% of the time that it is down. Depending on that measurement, you know that the other particle will have opposite spin 100% of time, once measured by distant observer.

But for the second far away observer, doing that second measurement on the other particle from the entangled pair, they'll also see particle with either up or down spin randomly 50% of the time. Because, and this is important bit, the 1st observer is not forcing the spin to be either up or down. The 1st observer is measuring it and getting random result, and thus the 2nd observer sees random results from their viewpoint too. The 1st observer knows what the 2nd observer will get even before the 2nd observer measures the other particle on their end. But that doesn't communicate any information to the 2nd observer.

What this means is that the two observers can not communicate (i.e. exchange information) using quantum entanglement.

EDIT:

Think of it this way. Let say we have a set of two "entangled" dice. When I roll my dice, you'll always get the number on the opposite side on your dice.

So, I roll my dice and get 3. This means when you roll your dice, you'll get 4. I roll my dice again, and get 5. You roll your dice and get 2.

For both of us, those are just meaningless sequences of random numbers. I can not set my dice to 3, to force your dice to roll 4. I can only roll my dice, and get some random number; when you roll your dice, you'll get the number on the opposite side. This is what entanglement is.

This means, I can not communicate anything to you using these entangled set of dice. I have no control over what number will appear on my dice when I roll it, and thus I also have no control over what number will appear on your dice when you roll it. From your point of view, the signal you get is simply random noise.