The Click Rate is the number of unique recipients that clicked any link in your email divided by the number of email addresses that were delivered the email.
You can view statistics for any email by clicking Reports on the top navigation or by clicking on the email on the Calendar.
You will find the Click Rate as a percentage near the right side of the page.
To see how many clicks the campaign received click on Detailed Interactions, then on the right in the "Interactions" column you'll see the number of clicks.
To see which email addresses clicked and how many times they clicked, click on the word "clicks"