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Lets say you have two entangled particles (A,B) and you already measured theirs spins and know that A has z+ and B has z-

What will happen if after the measurement you will set the spin of B to z+ (don't know if this is possible, but lets say that yes), will the spin of A change to opposite?

Corneliu Maftuleac
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No, but you can't really do that pre-measurement when they are entangled either.

See ("FTL" Communication with Quantum Entanglement?) for a more-general explanation I recently did about what quantum entanglement is; it may help demystify the basic idea of what entangled systems do together.

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CR Drost
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