How do I change the name next to home on my mac?

in the finder window, under places there is documents, desktop, applications and a little home symbol with a name next to it. for me, thats the name of my old email address. how do I change it?How do I change the name next to home on my mac?
Change your user name in system preferences:



System preferences

- Users

- Select User (change the name here!)

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