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1. Go into your module. 
2. In the Administration block, select Edit Settings 
3. Look for the Visible field (third  item down)
4. Click on the drop down options for the Visible field
5. Select Show
   
6. Click and select Show and Save changes at the bottom of the page. 

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This setting determines whether the module appears in the list of modules for students.

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  When When this is set to Hide, the module is invisible to all apart from staff with appropriate access rights (such as Editing Teachers). 

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If a module is "greyed-out" (appears in a paler colour) when an editing teacher looks at it then it is completely invisible to students.

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