In the profile editor, you can use the Network button and then click on Youtube. The Youtube popup (shown below) will appear.

By using this tool, you can configure NewsAssist to access the Youtube collection and look for videos matching your keywords. Just check of enter keywords, selected the search time period and select the order method.

When done with the configuration, click Create RSS and the feed will be added to the list of feeds. NewsAssist will then add corresponding Youtube videos on each refresh.