How long to do I have to add creditors

[HOMEBODY]

I have my meeting next week on July 2nd, but I have 2 creditors that I want to add. Do I have to do this before the meeting or can I add them after the meeting? I have an attorney but he wants to charge me $100 to do this and I am wondering if I can just do the form and file it myself. Its just a schedule with 2 creditors and the total is no more than $1000

[carlsbadmike]

I added several creditors about 7 weeks after filing and about 2 weeks after 341 meeting and my attorney charged me $125.