You will find the corresponding button in the upper right corner of the YouTube homepage.
In some situations this field isn't filled.
Talk to your friends, co-workers or YouTube fans and see when they're available to make sure you get good attendance.
Videos from that uploader will appear on your subscription feed.
If you have a popular YouTube channel already, select it so your fans can quickly join you.
Insert this into an IFRAME like this example, setting the width and height as needed.