It's easy to create a bibliography from your Zotero library. Select the citation style from Zotero settings (check the requirement for your assignment/course) for example a course assignemnt might require APA Style while another woiuld recomment IEEE citation style. If you do not see your preferred style from the menu, select Get Additional Styles
The Cite menu also provides option for including URLs in citations and also if you need to reinstall the word processor Add-in.
You can switch between Classic Add citation dialoge or use the search option from your Zotero collections when making a selection to cite a reference. "Classic View" is not the default option when you download Zotero, but it is a useful option to set up as your preference:
Create a quick bibliography from a list of items
Select the references or collections you want to include. Hold the control key and click to select multiple items. Right-click one of the selected items and choose Create Bibliography. Choose the bibliographic style you want, and select the output format: Save as RTF or HTML, copy to clipboard or print. (The RTF file format is compatible with all word processors.)
Zotero offers word processing plugins for MS Word, LibreOffice, and Google Docs. The plugin adds a Zotero toolbar to your word processor that allows you to add citations to your document while you write.
To add a citation, click the first icon "Insert Citation" on the toolbar. Select the reference you want to cite and click OK. Zotero will add the citation at your cursor.
At the end of your paper, click on "Insert Bibliography". Your bibliography will appear, and new citations will be added automatically. Change bibliographic styles with the last button on the toolbar "Document Preferences"
The following video shows how to integrate in text citations from your Zotero library and create a bibliography from each citation you have used in your text