First, ensure that the guest authentication method is available, and that guest enrollment is activated:

1. Enter the course as a teacher or administrator.
2. Select Administration | Course administration | Users | Enrolled users | Enrolment methods.

3. If the Guest access enrollment method is not listed on this page, use the Add method drop-down list to add it. If it's not available under that list, have your system administrator add it.
4. Once the Guest access enrollment method is listed, activate it. Under the Edit column, click on the Eye icon to open it.
5. Now, enable this method under the course settings.
6. Select Administration | Course administration | Edit settings. The Course settings page is displayed.
7. For the Allow guest access drop-down list, select Yes.
8. If you require a password for guest access, enter it into the Password field.
9. At the bottom of the page, click on the Save changes button.