Support
Howe2Math is run by one teacher, so support is by email and replies usually come within a school day.
What to include
The course, unit, and topic you were generating, the worksheet mode and question count, and a short description of what happened. If a worksheet came out wrong, attaching the PDF is the fastest way to get it fixed. Do not email student names or other student records.
Billing questions
Charges, the July–August pause, cancellation, and refunds are covered on the billing page, with the full policy in the terms of service.