Hello, thank you for your reply.
I’ve found the loop shortcode plugin on the plugin page. However, I don’t know where to go in order to change the code associate with it. The only option that it allows on the plugin page is to activate and deactivate.
As for the post slider plugin, because the plugins of our website is restricted by our school, we cannot add plugins on our own… can you give me some resource or some help on how to do it with css and javascript? I have some knowledge on java, and I am willing to learn.