Not sure what you mean here. Once you start Zotero, the menu bar with File, Edit, etc., will be at the top of the screen, the same as in any other Mac app.

If you're confused by something, can you take a screenshot, upload it somewhere (e.g., Dropbox or Google Drive), and provide a link here?

@yaoling422: Same answer. Provide a screenshot if you can't figure it out.

@zai950627

If you're confused by something, can you take a screenshot, upload it somewhere (e.g., Dropbox or Google Drive), and provide a link here?

@xiong_yf https://forums.zotero.org/discussion/comment/409954/#Comment_409954

Please follow the instructions