Dermot-
I'm assuming you uploaded the video to your own channel. Firstly, sign in to your channel (your account). At the top right of the screen you'll see your account name. If you click on that, you'll get a bunch of options (My Channel, Inbox, et). Click on My Videos. Next to the video you uploaded, there should be a small button that says "Edit." Click on that. Scroll down a bit and there is a section entitled "Broadcasting and Sharing Options." There you have your different privacy settings. You'll need to set yours to "Public" to make it so that others can see it.
Hope that helps.
Suzi
That's it Susy,,the right explain,,,,