save it to PC, then upload to youtube...
if that is not possible... then screen capture it, and upload..
use camstudio (from http://camstudio.org/) program to record your computer screen, then upload.
--for best editing....
use windows movie maker (included in your windows machine)... it can help you make beautiful slideshow or video clip(e.g. mixing your songs with pictures/video/lyric/etc).... then save it as video file such as wmv file format... finally upload.
or .. Just get those clips you want , save & convert them, and then mix/match with pix/sound/etc using windows movie maker to create new masterpieces....
this will help you.... Use 'zillatube'. This is the easiest (and also the fastest) way.
Zillatube produces mpg/mp3 formats from youtube that are compatible with windows movie maker(or media player), and more.
It is very easy to download and convert videos. Then edit those converted mp3/mpg videos with windows movie maker... save your file as wmv and then upload.
It works very well....just google search for "zillatube"