Issue with altering StarterCharacter JumpHeight

[forest glen]

When just inputting the highlighted line into a script and running it normally the jumpheight is changed and it works, when used in this script it changes the jumpheight but doesnt actually let me jump

[fallen ledge]

whats your default jump height

also it's best practice to get the humanoid from the localplayer character object instead

[prime river]

Instead of this, replace it with something that indexes the player parameter passed through the function.

Like so:

local Character = player.Character or player.CharacterAdded:Wait()

@forest glen

[forest glen]

im too new to understand how to implement this properly

like the highlighted line in my screenshot works fine when put anywhere except in this script

and it IS changing my jumpheight but i just cant jump even though its been placed at above 0, which is the default

[forest glen]

Just tried this and it doesnt change my jump height from 0 to 6 and still doesnt let me jump