Library Lookup makes it easy to find things in Omni. To configure it, go into Zotero's settings, to the General tab, and find the Locate section. Click on the Resolver option and a list of continents will show up. Go into North America and find York University.
Now when you use the Locate tool (the bottom button on the right-hand side of the right-hand item pane), choosing Library Lookup will search for the item in Omni. If you're working at another university or library, you can change your settings to use their catalogue while you're there, then change it back to York when you return.
Zotero's support page has links to all the documentation.
Search the Zotero forums to find answers to common questions, or to submit a "New Discussion".
For more options and answers to common problems, go to our Ask & Services.