Finally got to drive the truck parked it and found that it was locked in reverse position. Could not seem to get it out of gear. I pulled the top cover and inspected the fork yokes and shifted everything back and forth. Installed cover/shifter what I thought was in neutral, Upon testing I have 1st/2nd gear it appears, but reverse shows to be a forward gear also! Help!

What am I missing? Is there a step by step process for setting the gears correctly and mounting the top cover plate/shifter?