I had the same frustrating problem on mine. If you can get the manual for your mower it should have instructions. Mine gives the following instructions.
Make sure transaxle is in neutral. Loosen 2 locknuts on tie rod.
Turn center rod till gearshift lever falls into neutral lock gate on fender console.
Tighten nuts.
If you like I can e-mail the pics form my manual. My e-mail is
akoornneef@gmail.com
Andy
May 2006