UMCG or RUG computer
If you work on a UMCG or a RUG computer, the Mendeley plugin is already installed by default. One should open Word to check and look under the References tab (in Dutch: 'Verwijzingen' tab).
Laptop or PC at home
To install the Mendeley Plugin you need to first close Word and then on Mendeley Desktop go to Tools > Install MS Word Plugin.