This will usually depend upon the time of year. By default, Canvas shows the current term's courses on the Dashboard when logging in. If you do not see your course on the Dashboard, click the Courses link on the global navigation bar on the left side, and then All Courses. This will bring you to a screen listing current courses as well as Past Enrollments and Future Enrollments.
More than likely your course is listed under Future Enrollments. While you can click on the link to go into it, you may first want to click on the "star" icon to the left of the course name in this listing before clicking on the link. Clicking on the star will turn to a yellow color. This will cause the course to appear on the Canvas Dashboard, so that it will appear as a course card the next time you log-in.
If you cannot see the course at all even after clicking All Courses, first make sure that you are indeed listed as the instructor of record on myDU. If so, please submit an IT Support Center case so that we can look into why you have not been added to your Canvas site. If not, check with your department chair/Dean to ensure your name has been submitted to the Office of the Registrar as the instructor.