How to increase jumpower with scripts

How do increase humanoid jumpower with 1 simple script?

Humanoid.JumpPower = 55

Just set or add jump power

Just increase the JumpPower property.

local humanoid = char:FindFirstChildWhichIsA("Humanoid") -- Put your humanoid here!!
local morePower = 50
humanoid.JumpPower += morePower

is the humanoid part supposed to be my name?

No, where are you placing this script? (And local or not local)

its just a regular script i made, I also put the script into workspace.

Put the script inside of StarterCharacterScripts and put this inside:

local char = script.Parent
local human = char:WaitForChild("Humanoid")
local extraPower = 50
human.JumpPower += extraPower