How can I as a self employed childcare provider, who has business expenses but no business number or codes, complete my tax return using your free software?

A business number isn't required to complete your return. On the identification page of the business section (T2125), you'll need to enter a business name and address (your name and address are fine) and the industry code relating to your business. As a childcare provider, 624410 is the proper industry code.

Then you'll enter your income and related expenses.