Jinlun 125 11 gears stuck?

Hello, i have recently bought a new Jinlun and after two days the gears seem to be stuck..I think in first gear and will not come out into Neutral. I have tried rocking the bike back and forth, taking it to biting point and attempting to change, nothing has worked, someone suggested adjusting the spindle rod but i don know how to odo this..please help if you knwo what i should try to fix this.
Thankyou