First
Input the name of the computer that you would like to connect to in the "Server" field. A default is supplied for most activity for your convience.
Second
Change the resolution of the connection in the "Resolution" field. The default 640 × 480 is small, but it fits in a browser window easily. You may want to change this size to be easier to work with if you plan on bieng connected for a while. Fullscreen removes your browser window and inhabits your entire screen area, this is most like the standard connection.
Third
The "Advanced" section allows you to pass specific paramaters to the connection. Standard use will not require any use of the "Advanced" section; it exists solely for administration purposes.
NOTE: If you cannot connect, make sure that you are using Internet Explorer, and that you have allowed the ActiveX control to load. Windows XP Service Pack 2 users must click on the Information Bar and allow blocked content.