We are currently only allowing registered users with confirmed email to ask questions on the website. We are looking to customize the error message that appears on the "Ask a Question" page for non-registered users. What is the best way to customize the message that non-registered users will see? Which PHP file should be used for this? I imagine we can develop a layer for this?
By the way, the current message is simply: "You do not have permission to perform this operation". We would like to customize this with HTML to make a compelling presentation of why someone should register at the site.