You might not be logged in
You need to have a YouTube account linked to your Google+ account to comment and let others reply to that comment, so yes you need to have an account (be a member).
Because they don't like you
it will
I cant. because youtube wont let me subscribe to myself.lol
YouTube does not take iMovie files. You must share the file as a QuickTime file (do not do full quality - that will make it a .dv file).
You need to be 18.
Maby you put a birth year that is below the YouTube age limits.
Your tablet shows an almost full signal but will not let you watch a video on YouTube because when you stream via YouTube it will use a lot of power.
I don't know. Maybe it's your computer worrying about a virus. I have an account on Youtube called TheyCallMeDaBomb, LOOK IT UP!! :D
Some forums have different layouts, but generally turn out to be the same. You usually have to register to be able to post in a forum. Once you're registered and verified your email, you can usually begin posting immediately. To post, you will find an empty box in which to type your comment or question. Go ahead and type in your message and click on post, post reply, comment, or whatever it may say. Your post will then be published and available for others to comment on. Try to put your post in the category closest to the subject you are posting about. It's really very simple, and if you look around a bit, you'll usually find what you're looking for. Once you post a topic or comment on a thread, they like for you to comment back to let them know you appreciate their help or even that they took the time to read and comment.
They are just being stupid and mean so try again later
Don't know, still have the same problem. You figure it out and let meh know :)