How do I change text for all players via a LocalScript by using a RemoteEvent?

I have a text box inside the player's StarterGui and a LocalScript inside it with the following contents:

local textHeader = workspace.Screen.SurfaceGui.Frame.header
local textHeader2 = workspace.Screen2.SurfaceGui.Frame.header

script.Parent.FocusLost:connect(
    function(enterPressed)
        if enterPressed then
            print(script.Parent.Text)
            textHeader.Text = script.Parent.Text
            textHeader2.Text = script.Parent.Text
        end
    end
)

Basically, I have a part which has a SurfaceGui and a TextLabel inside it (in this case "textHeader" and "textHeader2"), and I'm trying to make it so that when a player types in text into their textbox which appears from their StarterGui, it will change the value of that text for all players, not just locally.

How would I go along with doing this? I'm not too familiar with RemoteEvents. Any help would be greatly appreciated.