Made a click-to-attack script for a morph, how do I make it damage others server-sided?

I am a beginner to Lua and I've ran into a bit of a roadblock.

To summarize the situation:

The morph model is in ReplicatedStorage. The script is a local script and it's in the model within ReplicatedStorage so it can be replicated to the players that click on the morph button. It performs the attack animation and damages other players normally on the client-side, but doesn't affect the server.

I can't figure out a good way to turn the script into something so the damage will affect the server instead of the client.

Here's the contents of the local script:

local Player = game.Players.LocalPlayer
local Mouse = Player:GetMouse()
local dmg = true
local hmnoid = script.Parent.Humanoid
local Attack = Instance.new("Animation")
Attack.AnimationId = "http://www.roblox.com/asset/?id=4602669454"
local AttackAnim = hmnoid:LoadAnimation(Attack)

Mouse.Button1Down:connect(function()
	dmg = true
  AttackAnim:Play()
  script.Parent.RHand.Touched:connect(function(hit)
   if hit.Parent.Humanoid and dmg == true then
    hit.Parent.Humanoid:TakeDamage(20)
    dmg = false
   end
  end)
end)

If anyone has any tips or suggestions for this, I would greatly appreciate it!

You have to use a Server Script to damage the humanoid on the server. And DO NOT just fire a remote to the server and damage the humanoid, the server should be the one who checks if they got touched or not.

Though you could fire a remote to tell the server when you are preforming the attack, and in that period the server checks if you hit anything.