Hi, @erika_leon 
(1) The Conferences tab hasn't been made visible to students in the navigation. To change that, follow the instructions in How do I manage Course Navigation links?
(2) Even if the conferences tab has been enabled, it doesn't yet have any content. This information in the blue box at the top of the lesson explains:
Links to sections that don't have any content and that students cannot create content for will be automatically hidden for students and will display the visibility icon to instructors.
So once you've added a conference, the now-enabled navigation item should display to students.
Check this out, and if it doesn't solve the problem, please come back so we can continue to work with you on this.
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