oki not that hard:
devices
player coordinate
game overlay
property
PC
set the PC device to this:
game overlay
set it to this:
make sure the scope is player
property
this is before the hard part, set the property to this:
blocks
this is the (kind of) hard part, go to the game overlay and click ‘blocks’

now make this type of block:
and the channel should be ‘change player height’.
now make this:
one last thing, put a space before “meters”