TDL has a Demo OJS 3 site available for you to test and learn in. It is located athttps://demo33-ojs-training.tdl.org/. To get login credentials for this site, email the TDL Helpdesk at firstname.lastname@example.org and provide your name, institution, and email address. [Note: TDL can also create a journal site just for you in within this Demo installation. Request a demo site via the TDL Helpdesk.]
Issues (bugs) for any of the PKP applications (including OJS) can be created here. If you're not sure whether you're encountering a bug or not, consider posting in thePKP Community Forum. Before creating a new issue, pleasesearch the existing ones to make sure you're not creating a duplicate.