How do i add this feature to my class gui?

So I have my screen gui here and inside is my script, and it looks like this:

player = script.Parent.Parent.Parent
backpack = player.Backpack

function chooseClass(class)
    for i, v in pairs(backpack:GetChildren()) do v:remove() end
    for i, v in pairs(class:GetChildren()) do
        if v:IsA("Tool") then
            v:clone().Parent = backpack
        elseif v:IsA("HopperBin") then
            v:clone().Parent = backpack
        end
    end

    script.Parent.Main.Visible = false
    script.Parent.Title.Visible = false
end

function onHumanoidDied(humanoid, player)
    script.Parent.Main.Visible = true
    script.Parent.Title.Visible = true
    end

for i, v in pairs(script.Parent.Main:GetChildren()) do
    v.MouseButton1Up:connect(function () chooseClass(v) end)
end

And then there is also a frame inside the screen gui with text buttons and tool inside them.

What I need is a feature where one of the buttons is connected to a gamepass and if you own the gamepass you get the tools inside it. Please help me create a script and tell me where to place it.