You can download the Revit plug-in installer here
If you exerience problems, contact email@example.com to get the "StreamBIM-Revit plug-in" installation file. Once the plug-in has been downloaded, you will be asked if you want to run the StreamBIM Add-in when you launch Revit.
You'll find StreamBIM in Revit under "Add-ins" and "External Tools." Simply log in again with your StreamBIM account and select the project you want to connect with Revit. You can choose to load the StreamBIM Add-in every time you open Revit or load the StreamBIM Add-in for one instance only.
Once your project is connected, it's easy to export IFC files from Revit to StreamBIM. In StreamBIM, select the destination folder for the IFC file, and then indicate whether or not to begin processing after the file is imported.
You may also export drawings to StreamBIM. Select any of the available drawings from the list in the left column. Double click to add the drawings to the export list on the right column. Click Upload to export your selected drawings.