Arduino Laser Engraver cd drive - what do i connect where?
You can read in the datasheet that 1A-1B are a pair(motor coil 1), and 2A-2B are a pair (motor coil 2).

So 1A and 1B should go to one coil, and 2A and 2B should go to the other coil.

That means you should probably solder your wires straight. I don't know about the polarity of your stepper motor of course, so it might run the wrong way or something... Unless you have the datasheet of the stepper motor, you should probably find out by trial and error. That gives you 8 possible configurations:

1B  1A    2A  2B
1   2     3   4
1   2     4   3
2   1     3   4
2   1     4   3
3   4     1   2
4   3     1   2
3   4     2   1
4   3     2   1


The stepper motor won't be harmed if you have the polarity reversed.