guitarfx32 :
How I use m.2 ssd with asrock b75 pro 3m motherboard ?
You don't.
http://www.asrock.com/mb/Intel/B75%20Pro3-M/
That board has no m.2 slot, and even if you get a PCI-e adapter for an m.2 drive, you can't boot from it.
And for a secondary drive, it would make no sense.
Don't get caught up in the "m.2" hype.
A regular 2.5" SATA III SSD will do just fine.