Try restarting the Chromebook by pressing/holding the power button for at least 5 seconds. Chromebooks update automatically every time they are restarted.
If the Chromebook is still behaving unexpectedly, try to trouble-shoot by performing a google search, asking your teacher(s), chatting with friends, etc... If the problem persists, bring the Chromebook to the helpdesk in the library. Fill out a form that explains what the problem is and leave for our helpdesk to troubleshoot. Expect a 48 hr turn-around time.