Sit and jump not true with script?

In this part of the script you need to use "==" to detect something or else it will think its trying to change something.

if script.Parent.Sit = true then
    script.Parent.Jump = true
end

Fixed Script (also its seeing if they jumped and if they jumped they jump again?)

if script.Parent.Sit == true then
    script.Parent.Jump = true
end

function onTouched(hit)
    local h = hit.Parent:findFirstChild("Humanoid")
    if h ~= nil then
        h.Sit = true
        h.Health = h.Health - 0
    end
end
script.Parent.Touched:connect(onTouched)

Fixed Script (you were trying to subtract nothing from the players health instead of killing them, btw if this doesent work then It could be because of of FE, the "h" is not finding the humanoid or both)

function onTouched(hit)
    h = hit.Parent:findFirstChild("Humanoid")
    if h ~= nil then
        h.Sit = true
        h.Health = 0
    end
end
script.Parent.Touched:connect(onTouched)

Accept if this helped! :D

######Edit; also fixed indentation