Hello Rainer,This should be a fairly easy adjustment.Remove the pin just outside the gear box,loosen the lock nut on the shifting fork inside the gearbox.Turn the shifting shaft until the gear rests properly in the final drive.Place the shift lever in neutral and see if the linkage now lines up for the pin,may need a bit of final adjustment.Check low gear engagement also.Remember to tighten the lock nut.I may have forgotten a bit,it’s been a while.
If you search this forum you may find info on the Breeze.