the title explains it
Sorry admins if I'm not allowed to help, but here's how to do it.
Insert a ScreenGui into StarterGui
Insert a TextLabel into the ScreenGui you just created
Insert a LocalScript into the TextLabel.
Write the following code inside the LocalScript:
script.Parent.Text = game.Players.LocalPlayer.Name
Change the text of the TextLabel to "Name" (You can do so by going to the Properties of the TextLabel)
Insert another TextLabel into the ScreenGui
Change the text of that TextLabel to "YOU KILLED"
Position both TextLabels on the screen so it says "YOU KILLED Name"
Playtest the game and see if it works!