Once you've installed it, you'll find an icon with IFC in Revit. Then you can start working with it. If you google for IFC and Revit you will find a lot of tutorials in which the handling is explained step by step. Normally you only have to export and then IFC export and then you have your first IFC file.
If you want deeper into the settings, I would recommend you the Tourials you look at.
I hope I could help you.
Best Regards
Dill Khan
