Adjusting water and float in toilet

a
Fluid Master ballcock you can adjust the level by squeezing the steel piece on vertical wire arm at the side, pulling the can up and down down. pull the can up to raise the tank level and down to lower it. Did that answer your question ? Tom

Top state it correctly also please open the link below watch the clip will give you more info, Thanks.

John

https://www.youtube.com/watch?v=gOSO5a0teIQ

Some of the 400 series have a screw adjustment, a long black threaded screw you turn. Tighten to raise, unscrew to lower the water level.