In most cases, you can follow the traces from the connection terminals to the bass/tweeter sections.
The bass panel traces typically go up then to the left & right.
The tweeter traces go up then either to the left or to the right, depending on if it is the left/right speaker.
There is also a polarity flip on the tweeter panel, so wire the crossover as though there is no polarity flip.
Then when you are ready to solder the wires to the terminals, that's when you flip the polarity.
So the wiring order from the crossover will be red then white, then white, then red.
The left speaker will have the bass terminals on the left and tweeter terminals on the right.
The right speaker will have the bass terminals on the right and the tweeter terminals on the left.
Hope that helps!