To create a bibliography from a collection, right-click on the collection icon.
There is an integrated Zotero toolbar in Word, LibreOffice and Google Docs. You can only use this toolbar if Zotero is running.
: opens a search window that allows you to search for citations in your Zotero library, to select the style and insert the citation. For certain styles requiring footnotes, Zotero creates automatically the footnote and inserts the citation inside. You can also add a page number, a prefix or a suffix to a citation.
: creates automatically a bibliography with all the references cited in your text.
: allows you to change the style of your references.
If you do not find the Zotero toolbar, try to go to Preferences, Cite, Word Processors, and install or reinstall the Word or LibreOffice plugin. It solves the problem in 80% of the cases.
You can easily insert bibliographic references in any text field in your Web browser, such as an e-mail, a Google Docs document, a blog... Just drag and drop the reference, the citation will appear fully formatted in the default style. To set or change your default style, select Options in the Tools menu, then Export and choose the style from the drop-down menu.
Select Preferences in the Edit menu -> Cite, and click on Style Preview
Select a reference, click on Refresh, and you can preview the reference in all the styles available in your Zotero...