Hi Jessica,
You mention using the no authentication method. Please don't use this method as it creates a very insecure Moodle site, and is not recommended (source: documentation No authentication).
MoodleCloud
Custom instructions do not show on login page
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។