How do I find a Proxy URL?

I've changed school affiliations, and now all the references I downloaded into Zotero thru paid subscription services (JSTOR, eBosco host, etc.) thru my past school are no longer accessible. How do I find the information I need to change my proxy settings in Preferences/Proxies? Better yet, can I ask Zotero to do it automatically?
Thank you!
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