How do I add a category to my accounts? I need to separate different types for gas and fuel expenses

Warm welcome, and thank you for posting here in the forum. I'll share some information that could help you on the way.

You can use the Schedule C form to allow you to report your self-employed income and expenses you've generated or lost in your business to the IRS. It's also referred to as Form 1040.

QuickBooks Self-Employed associates each transaction you categorize with a line on your Schedule C. You can use the Car and Truck category to categorize expenses related to using your vehicle for business. 

This includes expenses like fuel, insurance, and fees. When you categorize car and truck expenses, always mark them as a business. Don't split them between business and personal.

Please refer to this article for more detailed information: Schedule C and expense categories in QuickBooks Self-Employed.

You can also go through this article to learn what we updated with expense categories: Updates to expense categories in QuickBooks Self-Employed.

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