Double click Video item to specify the path to video file. To start testing video you can use one of the sample files:
http://www.selteco.com/flashdesigner/blue.flv
The path can either start with http:// or you can use path relative to the SWF file. You can not use ../ to navigate to higher folders. You can use only FLV file in the same directory or in subfolders.
When the FLV finishes you can specify a jump to one of Main Movie frames in the "After finished jump to"" field. If you leave it blank the movie will just stop playing.