If you are using Macmillan deep integration, you can change your course homepage to one that includes the Macmillan widget. Follow the directions in How can I change my course homepage? and select "Course Home with Macmillan Widget" in step 6:

homepages tool with Course Home with Macmillan Widget page selected

This will apply a homepage to your course with the Macmillan widget at the top right side of the page under the Announcements tool:

course homepage with Macmillan widget under the Announcements tool