Ok twds,I went to BPS and checked it out.You didn't say it was a MOTORGUIDE,They are easy.
1-Take the top cover off.Should be 3 screws-access from bottom of head.
2-Follow the cables of the foot control until you find the RACK.I believe there are 2-4 screws that hold it in place.Remove the screws,then lift the Rack up and rotate the lower unit to where you want it.Adjust the foot control to where you want it,and replace the Rack.
3-Orient the directional arrow to coincide with the change in the lower unit,and replace the cover.
NOTE: make sure you don't inadvertently disconnect any wires.
I have a MOTORGUIDE.And have had it apart a few times.I have to pop the top on it again to adjust the directional arrow,because I was in a hurry last time I had it apart.Didn't line it up right.
Hope this helps you out.