Based on the doc found here (at the bottom): https://docs.civicrm.org/user/en/4.7/reporting/set-up , it should be possible to edit existing reports (like adding email settings). Currently not even copying a report makes it editable, so everytime a new report needs to be created if you want to permanently change a setting (email in my case, to automatically send report results). So my question: how do I edit an existing report?
It sounds like you're missing the "Administer Reports" permission.
- Go to CiviCRM's **Administer menu » Users and Permissions » Permissions (Access Control).
- Select the first option ("CMS Access Control", where "CMS" is the name of your CMS).
- Assign the "CiviReport: administer Reports" permission to a role you have.
- Save the permission.
It's also worth replicating a problem on the demo site (demo.civicrm.org) if this doesn't resolve your issue. That way you can edit your question knowing if the problem you're experiencing is specific to your site, or to CiviCRM in general.