why is script Source locked and how do i fix it?

local Severer = Instance.new("Script") Severer.Souce = [[ Function OnClick()

print("works!")

end script.Parent.ClickDetector.MouseClick:Connect(OnClick)

]]

says Source is locked lacking permission

BUT I'M THE CREATOR IN STUDIO TEST MODE I'M ENTITLED TO ALL PERMISSIONS THERE IS!!!!!

You are not allowed to edit another scripts source as its not usable through scripts or local scripts but it can be used through the command bar or plugins you can get more information about this by clicking the link i have provided for you below

https://developer.roblox.com/api-reference/property/Script/Source