This is an update of my post of 17 November 2010 find it here.
A requirement of the college I attend is we have to use Harvard style referencing but they want you to include the page number of the citation but the default option does not include page numbers.
They require the "in text" citation to look like this (Trigg, 2006, p.6) but the default in Zotero looks like this (Trigg, 2006).
There is a simple solution you can download from Zotero a vast number of citation styles that can be added to the default set that comes with the initial download.
Go to this page Zotero Styles and download the "Harvard - Adapted for Leeds Met" option, click the [install ] link. I could not fathom how it worked to start but the Zotero Forum proved very helpful. The new option comes up when you use the Word plug-in to add a citation. Make sure Word is closed when you download the new option. When you next use Word you will find at the bottom of the dialog box that opens when you choose to insert citation from the Zotero toolbar menu there will be a button at the bottom marked Page in the box next to it type the page number you want to add to the citation. Choose your citation in the normal way and Bingo the page number appears as above.
Click image to enlarge.