New journals using OJS should use OJS 3, as OJS 2 retired and not recommended for ongoing use.
A demonstration journal using OJS 2.4.8 is available at https://demo.publicknowledgeproject.org/ojs2/demo/index.php/demojournal.
Users of OJS 2 can test the software – as a Journal Manager, Editor, or a Reviewer – at a second demonstration journal site that has been set up at https://demo.publicknowledgeproject.org/ojs2/testdrive/.
Log in with username: admin and password: testdrive, and select one of the available roles in the editorial process, and explore how it operates.
Also feel free to submit a test manuscript to see what authors experience, or assign submissions to reviewers, and log in as an assigned reviewer.