How Can I Unblock Runescape On A School Laptop Runescape Help On My School Laptop Please...?

Runescape help on my school laptop please...? - how can i unblock runescape on a school laptop

I opened my Internet so I can go on runescape, but it is still a problem. It is a red X in the upper left corner, but my school has the latest version of Java. The message is not in the lower left corner of the screen when loading Java applet to say ... What should I do?