To download video at youtube.com, follow this steps:

1. Take the URL of the video. For example this one:

http: //www.youtube.com/watch?v=ZZTRFPY-yvM

2. You must changes the URL to download video. Example:

http: //www.youtube.com/watch?v=ZZTRFPY-yvM

Changes to

http: //www.kissyoutube.com/watch?v=ZZTRFPY-yvM

3. Wait for few second. After showing new page, find download menus. And click it.

4. Now you have download at youtube.com.