Hello @NicholeC53 ,
You should be able to add Q&A to your webinar after initially scheduling it. When you go to your Webinars list and click the edit button next to the webinar you should be able check the box for Q7A. If you do not see the check box for Q&A, then go to your Meeting Settings, search for Q&A and make sure that you have this setting enabled:

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Thanks!