Quest? Removing the cube on a new project

I have just recently downloaded blender i have been trying to under stand the program and its interfaces, but the biggest obstacle I have is removing the cube when strating a new project.

I have read a tutorial stating that by pressing CTRL X and it asks me to delete currnet object? I select yes, but the cube is never removed it is always on there, so i need to know what might be wrong, anyone,

also i have downloaded the latest version of blender from blender.org if this helps

Open Blender and don’t touch anything on the screen. Hit X to delete the Cube and then Ctrl-U to save that .blend as the default startup one.

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ok will try that