If you just want to enter gross receipts (which is my personal preferred method), just enter your total amount as cash or checks under Other Self-Employed Income. This is how you get there:
If your self-employment income was only from cash, personal checks, credit card payments.
Type Schedule C in the Search box and then select the Jump to link.
This will take you to where you can enter any cash, personal checks, credit card payments, or cryptocurrency (Form 1099-K) related to your self-employment.
You may first be asked some general questions about your business.
After you answer them, you’ll be taken to the Let's enter the income for (your line of work) screen where you can enter this income as Other self-employed Income.