Edit > Preferences > Cite > Styles > Style Manager and choose the annotated style you added in Step 3 (APA or Chicago)
Edit > Preferences > Export > Default Format and choose the annotated style you added in Step 3 (APA or Chicago)
A dialog box will pop up and you can choose the annotated style you added in Step 3 (APA or Chicago), output mode, and output method.
Go to the Zotero Style Repository for over 10,000 additional styles. All of these styles are also supported by Mendeley, Papers and many more.
Open Zotero Standalone, go to the top menu, and find
Edit > Preferences > Cite > Styles and click on "Get additional styles.."