http://www.question2answer.org/qa/15785/how-to-hide-the-edit-by-notice
Unless you want it invisible in the page source, the simplest way to hide this is via CSS's display:none; rule in a custom theme.
Welcome to the Q&A site for Question2Answer.
If you have a question about Q2A, please ask here, in English.
To report a bug, please create a new issue on Github or ask a question here with the bug tag.
If you just want to try Q2A, please use the demo site.