First of all, you need to create a Comment Screen if there isn't any in your JIRA instance yet. I suppose this is what is causing your problem.
In the admin section of JIRA, go to Screens and add a new screen. Name it "Comment Screen" and don't add any fields to it, like this:
Screen Shot 2016-10-01 at 13.13.50.png
I assume you already have found the workflow editor and have already found out how you can add a status and a transition to a workflow.
So, edit your workflow and in the workflow editor, select the Pass QA Checks transition. Click Edit and associate the Comment Screen with the transition:
Screen Shot 2016-10-01 at 13.17.37.png
Don't forget to publish your modified workflow when you're done. Should be working like a charm now.
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