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

homepages tool with Course Home with McGraw-Hill Connect Widget page selected

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

course homepage with McGraw-Hill Connect widget under the Announcements tool