Melinda,
If you don't have the Copy Course button it may be because your admins have hidden it (my school does this) or that you don't have access to create your own courses. When using the Copy Course button it does create a new copy.
If the course shell already exists what you need to do is to go to your new course and import the content from the past course. Here is a guide https://community.canvaslms.com/docs/DOC-12935-415257077
For schools who automatically create course shells and manage the enrollments it's important to use this method so that you are using the course set up to sync with the student information system.
Hope that helps,
Rick
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