To create a bibliography from a collection, right-click on the collection icon.
There is a built-in Zotero toolbar in Word, LibreOffice and Google Docs. You can only use this toolbar when 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 that use footnotes, Zotero will automatically create the footnote and insert the citation. You can also add a page number, a prefix or a suffix to a citation.
: inserts the contents of a Zotero note into your text.
: automatically creates a bibliography of all the references cited in your text.
: allows you to change the style of your references.
If you cannot find the Zotero toolbar, try going to Preferences, Cite, Word Processors, and install or reinstall the Word or LibreOffice plugin. This will solve the problem in most cases.
To quickly visualise what a reference will look like with the different styles included in your Zotero, you can use the Style Preview tab. You can find it by clicking on the button on the Cite tab of the Preferences menu. Select a reference from your library and click on Refresh.