It was already possible to report videos, and now you can also report accounts and comments. It's very simple to inform moderators of an instance about a problematic account. Go to the account page, click on the 3 horizontal dots on the right of the profile name, and select <i>Report this account</i>. A window will appear in which you can indicate the issue encountered and/or describe it. In the same way, it is now easy to report a comment: click on the <i>Options</i> menu under the comment you wish to report and select <i>Report this comment</i>.