How to adjust drive speed to ';low'; on my honda hr214 mower?

the drive speed is only on high how do i fix, i noticed when i move lever to low there is no change. is there supposed to be a spring on the lever that moves under the carriage to change the speed?How to adjust drive speed to ';low'; on my honda hr214 mower?
If you follow the throttle cable all the way down to the carburetor there will be a screw, move the throttle back and forth and see if it is holding the cable and if not the just tighten it up it should be under the air cleaner that takes a flat head screw driver remove it and look at the cable it might be stuck in the high position. place it on low and loosen the screw and it should go all the way to the low position then tighten the screw and pull it all the way open it should go both ways if not then go to the parts house and get a new cable for the right piece of machinery you have and replace then put the air cleaner back on and your good to go.