there are two "marks" to line up.
One is the upper balancer, line the cut out in the shaft with the mark on the engine. Look from above. Replace the balancer seal and if the recall retainer plate hasn't been installed do it now, otherwise Murphy's law will apply and that seal will walk itself out once you put it back together.
The lower one has to have the bolt removed from the rear of the block and a 6mm bolt that's 100mm long has to be inserted in there to lock the shaft in place.