Keep trying.. gotta find neutral. The cable that moves the shifter up and down on the trans is now adjusted..
There's going to be alot more trying issues then this problem. Get someone that will help you that understands things like these..
Not being smart but I don't have one anymore and it's hard to tell you how to adjust these cables. These joyner are not like typical side by sides. . There's no good manual and are left in dark and have to be able to make things just work or fit.
Good luck on your endeavor.