How do I Add a YouTube Playlist with the YouTube Widget?

Hi! I am using Upfront and would like to add a playlist on YouTube to a page on my website. I see that Upfront has the YouTube widget and that I can select multiple video and there is a even a radio button to select "playlist". However, I cannot get anything but the grey boxes to appear on the page. How do I specify which playlist I would like to appear in the widget? In the box below the radio button I see a box that asked for the "YouTube Username or Channel ID". I found the channel ID on youtube and entered into that box but to no result. Moreover, my channel has multiple playlists. If I just enter the channel ID, how will Upfront know what playlist to import? It sounds like to meet I would need to enter some "playlist ID" but I don't see where to do that?

What is the fastest and easiest way to use the widget to set up a playlist on the site? I've attached a screenshot of what I see when trying to configure the widget.

Thanks!
Heath