You must take the post-petition course - called the "Debt Management" course - between the time you file the petition and 45 days after the Creditors Meeting.
After taking the course, the certificate must be filed with the clerk at the Bankruptcy court. In some Bankruptcy courts, you will be asked to instead or also file a "Local Form" with the information from the certificate on it. If your court requires this, you can get the form from the court clerk.
If you do not file the certificate within about 30-40 days after the Creditors Meeting, you will get a notice from the court indicating that your case will be dismissed unless you file the certificate by the deadline.
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