When you see the folders with a jumping yellow paper, it means that you haven´t read the last post. As soon as you read it, the yellow paper disappears. Threads that have been deactivated show a little padlock on top of the folder. Threads that are designated as important show a red exclamation mark and appear first in the list of threads in a section, but you are still able to post in them.
There is also an Edit button above every post so if you have a further thought after making post or want to make a correction, you can click it and do so. There is also a Delete button if you want to remove your post. 
Since the questions have been answered and the test was successful, this thread is now being deactivated. 