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Once the guest access has been set, you can then advise your guest to go to moodle.ucl.ac.uk and click on the 'log in as a guest' link, which appears within the login box on the Moodle site home page. Once they have accepted the site terms and conditions, they will be able to find the course.
Students and staff who are already logged into Moodle will be able to enter the course directly as a guest upon entering the password, or clicking the guest access button, if no password is required.