add-in toolbar for mac 2015

Hi,
I have managed, once and on my mac air, to install something which made the toolbar appear in the new mac version of word (the 2016 / 2015 version). I am trying to find this software so that my imac will play ball but I can't find it anywhere. I have downloaded the software indicated in the zotero page and that is not helping. Word opens, I have zotero installed, but there is no possibility of inserting citations - so it's useless!
Can anyone point me in the right direction, please?
Many thanks.
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