Go to the course where you would like to add the link and either choose the content area, or add a new content area, where you would like the link to live.
Once in the content area, hover over Build Content and then click Web Link.
Provide a name for your link.
In the URL space, enter the address Macmillan provided during installation set up.
Scroll down the page to the fourth section, and be sure that the link will "Open in a New Window." (This may be your default setting.)
Save your settings by clicking Submit.
Your Macmillan course is now in Blackboard. When first used, the student will be taken through a sign-on and after that the students will just need to click on the link to be taken straight to the course.