Hi kyliecool,
Thanks for your post and welcome to the Community Forum ! If you go to Inset/Modify in the report > select the show hide button, if available columns do not have that specific field you're after this will not be able to be added to the report. If you need the email address added to that particular report, as a work around you could add the customers email address to the custom field in their card file, once you've done this you can filter that column into the report.
Do let us know if you have any further questions.
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