To display on-site messages to your visitors, you must first activate them.
To activate them, in the on-site message settings, click the Activate button.
A validation check will be performed on the on-site message, highlighting any issues found (which you will be required to resolve to activate your on-site message). If no issues are detected, the on-site message will be visible.
You can suspend the display of an on-site message at any time by clicking the Deactivate button on its configuration page.