1. Open Visual Studio .NET
2. Select File -> Open -> Project from web
This will open a new window, enter the location of your project on your
website, i.e. if my project is in the root of my website I would type www.mysitename.com.
4. Click OK
5. Next enter your username and password if prompted.
6. A new window will appear, select the project file to open
7. Click OPEN
8. Enter your username and password.
You now may add files and folders to the project as normal.