Student evaluation of instruction is important because instructors often make changes in courses based upon student feedback. Please take this opportunity to provide instructor & course feedback.
No, not all courses have evaluations every semester. But most do have evaluations which take place online or in-class.
Simply check your RaiderNet email account. These evaluation emails will have the subject line, "End of Semeter IDEA Rating for ...".
Yes, unless you make personally identifiable remarks in the comments section. Your instructor will be able to see the comments so he or she can make improvements to the course.