If you mean that your icon for the voice memo app is in a folder and you want it out on its own then just put your finger on the icon until it starts to wiggle (all of the apps will) an drag it out of the folder and on to the screen you want it on. If you're trying to put a single voice memo on the home screen, you can't.
We need to get this fixed, tazette0121. This is a built in app, so it cannot be deleted. You may look in other the app folders to locate it. The other option is to reset the home screen. You would go to Settings then General then Reset, then Reset Home Screen Layout to do this.
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