Help with receiving remoteEvents needed!?

Here we can make use of the event OnServerEvent [1]. It is used like so:

remote_event.OnServerEvent:Connect(function(p, arg1, arg2, arg3) -- etc.

end)

where arg1, arg2 (and so on) are the arguments which are passed to FireServer(arg1, arg2) in a localscript.

In your case, an appropriate receiver for the RemoteEvent would look like this:

remote_event.OnServerEvent:Connect(function(p, player) -- etc.
	print(player_arg.Name)
end)

What's more, we can make use of the engine's capability to automatically fill in the correct firing player. You may have noticed that I glossed over the p argument above. It turns out it's exactly what we need: a trusted way to tell which Player fired the RemoteEvent!

Put this in a server script:

local replicatedstorage = game:GetService("ReplicatedStorage")
local remoteevent = replicatedstorage:WaitForChild("RemoteEvent")

remoteevent.OnServerEvent:Connect(function(p)
	print(p.Name)
end)

and put this in a local script:

local replicatedstorage = game:GetService("ReplicatedStorage")
local remotefunction = replicatedstorage:WaitForChild("RemoteEvent")

script.Parent.Activated:Connect(function()
  remotefunction:FireServer() -- player argument will be automatically filled in by the server.
end)

[1]: Roblox DevHub Reference: OnServerEvent