While creating or editing a Feedback activity, you can set the following After submitting options :
Page after submit
You can add custom content to the page a user sees following submission of their answers. This is typically something along the lines of 'Thank you for submitting your feedback...'. This content is created via an HTML editor so may contain text, links, images or multimedia if required.
By default, after a feedback response is submitted, the target of the continue button shown at the bottom of the screen is the course page, however you can specify another target URL for this button.