You can use the databases, including the OED, from off campus. But first, you must go through the Library page. https://www.montclair.edu/library/
Then, Databases -> Oxford English Dictionary '> Click on it.
Then you will get a prompt to Log In. Use your NetID and password.
Here is a link to "Why can't I access a database from off campus" It shouldbe helpful.
IF you have any problems, a "chat" window will open up. You can "chat" online with a librarian.