To install the Revit Plugin, close any Revit session that is open. Then in the dRofus client go to Settings-> Addins-> Install Autodesk Revit Add-on
The next time you open a session of Revit you will see a new tab on the ribbon for dRofus items which will appear in the ribbon panel .
To know if your Revit version is compatible with dRofus - go here Revit Version Support : dRofus