File:EFTPS - Form 941 First Time Submission Warning.png

A screenshot of EFTPS showing the warning it displays on first time submission:

Your payment has not been scheduled yet because: (X) You are not enrolled for this tax form. If you don't want to proceed with this payment, select Abandon below. If you want to change the tax type, date, or amount for this new payment, select Edit below. If you want to continue and schedule this payment, select Continue below. If you want to cancel the original payment, click on "Cancel a Tax Payment to the left. Note: Payments cannot be canceled less than two business days before their scheduled date.