if you are asking how to get permission from parents idk. but if you are asking how to sign up if you are young, then you put an older age such as 15.
You have to get permission from the video game company before you can publish your videos on YouTube.
Not without permission.
If you do not have the permission by any party, yes it is illegal.
of course not. all you need is a camera, a youtube account, and i suppose if you're a kid which I'm guessing you are you'll probably need your parents permission
contact the youtube sit creators and they should remove the unwanted video
Yes, you should be able to visit YouTube as long as you are over 13; or if you're under 13, with parental permission. You should also be able to visit YouTube if you're not visiting YouTube in one of the countries that YouTube is blocked in.
Comment on the video or on their account
Yes, you can use footage from videos if they have a Creative Commons mark on them, or if you get permission and are granted permission from the uploader/owner of the content originally to post the footage in your video. Make sure you read up on the copyright rules as all copyright rules apply in YouTube and abiding by YouTube's rules will help maintain your presence on YouTube.
No, as long as it is entirely your original work, or you have permission from the rightsholders.
Yes, it is perfectly okay to mention YouTube in a book. However, if you plan to use the YouTube logo anywhere in the book, you need to get permission and follow YouTube's logo procedures guideline in order to avoid a lawsuit.
Submit only videos to YouTube that do not contain material copyrighted by someone else or get the necessary permission before you post.
After contacting the user, you should file a privacy violation complaint to YouTube. There is a form in the YouTube Help Center for this exact purpose.