I can see how crucial it is to change your assigned community name. With this, I've got easy steps to ensure you can achieve this process.
I recommend going to the Profile icon and selecting My Settings. You will then be able to select the Personal section and update the Community name from there. I added screenshots below for visual references.
In case you need different guidelines for effectively managing your business using QBO, you can read this article: Help guide for QuickBooks Online.
Feel free to add a comment below anytime whenever you have further concerns about managing a user's name in the Community or other QuickBooks-related concerns. I'm always here to help, intaprint3d. Take care.
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