As far as anyone can tell you can't use it transmit information. Their states are mirrored but you can't modify the state of on of the pairs to change the state of the other, that just breaks the entanglement. So all you really have are two particles that happen to be in the same random state at any given time.

I don't think you can even tell given only one of the particles in a pair if it is still entangled so you couldn't even destructively send small amounts of information either. It's a neat work around for semihard scifi but the universe is stubbornly resistant to any pathways for anything including information travelling faster than the speed of light.

https://en.wikipedia.org/wiki/No-communication_theorem

Quantum entanglement cannot transmit information. Full stop. Let alone FTL.

When you measure an entangled particle that tells you, the observer, the corresponding characteristic of the other particle in the pair, but it will tell no one who has access to the other particle anything at all about what you wanted to say.

This is like transmitting information from you to you about a faraway thing (instantaneously! "FTL", but read on), but it's not useful because what you want to transmit information from you to someone else far away rather than from you to you.

No, because you can only randomly measure the state of your particle and therefore the remote particle. (then lose the entanglement) But you can’t put the particle into a state.

All of human knowledge and observation so far points to the fact that we can't break the light barrier

my poor understanding of it is that it's like a split tally stick.

https://en.wikipedia.org/wiki/Tally_stick#Split_tally

So what if you put each half of split tally stick in a box hidden from view then move them a light year apart and then open your box? You immediately know what's on other stick but you can't change it anyway.

and also the act of viewing the stick destroys it.