Oh, it'll work in a bit.
YouTube has to process videos before they become available when you upload.
If there are no problems with your video then you will be able to see it in probably a couple minutes.
Okay, after you click "edit my profile" you click the edit button on the media box.
There will be a space where you can type in the title of the media and a space where you should put the URL of the youtube link.
After you put in the url you click update on the media box and then save your profile.