Watch the video below to learn how to access full-text articles via Zotero, even when the articles are behind a paywall. Note - use the chapter menu (three lines in the upper left corner of the video) to jump to the second chapter, which is about finding full-text.
The locate option lets you find the full-text for sources that don't already have the full-text available in your Zotero library.

If you are an Oregon State University employee or student, use the library option to look for sources that require subscription access.

To set up access settings to connect to OSU Libraries, go to the Settings menu (on PCs Settings are under the Edit menu; on Macs Settings are under the Apple menu). Choose the General tab, then scroll to the Locate section. In the Resolver box that says "custom," click the pull-down menu to find Oregon State University. The Base URL box will then automatically fill in with the appropriate URL.
