How do I link my syllabus to a module or page?
Robin, greetings and welcome to the Canvas Community! If by Syllabus you mean your literal syllabus file, then the following guides will help.
Add syllabus file to Module - How do I add assignment types, pages, and files as module items?
Add syllabus file to Page - How do I insert course files into the Rich Content Editor using the Content Selector?
Yet, if you have added your syllabus file or content to the Syllabus page in Canvas (link on left) and are trying to link it other places in your course then you can't link to it on Modules, but you can link to it on a Page. See the following guide for information on how to do this - How do I insert links to course content into the Rich Content Editor using the Content Selector?
Hope this helps!
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