You can bookmark a Test Case by selecting the checkbox to the left of a Test Case and click on Bookmark.
Alternatively, while the test case is open, you can click "More options" and choose "Add to bookmarks":
You can bookmark a Test Case by selecting the checkbox to the left of a Test Case and click on Bookmark.
Alternatively, while the test case is open, you can click "More options" and choose "Add to bookmarks":