@359111 ,
I thought I'd add on here, too in addition to the information provided by Chris.
Courses that appear in your Future Enrollments aren't active courses. Active courses are courses that are running during the current term you're in, and those are controlled by start and end dates defined by your Canvas administrator. In your case, it appears that your Canvas Admin doesn't permit students to access the courses directly that you can see in your Future Enrollments. Once the start date for the course begins, the course will automatically move to your active enrollments and you'll be able to star it off (if it doesn't by default appear on your dashboard), as well as being able to access it.
Does that make more sense? I hope this helps!
- Noah