@Sofya ,
As JohnKorchok replied, Mendeley Cite is not a Microsoft product, and it is not supported on Q&A forum.
Please contact Support of Mendeley Cite for assistance. Thanks for your understanding.
Besides, I find the link: https://www.mendeley.com/reference-management/mendeley-cite, and I take a related screenshot below.
I also find "How to add Mendeley plugin into word". Hope the information could be helpful.
Please note, since the web sites are not hosted by Microsoft, the links may change without notice. Microsoft does not guarantee the accuracy of them.
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