You have been told the solution. JUST DO IT! None of the other users in this user-to-user forum can do it for you. There is a link in the post you marked as Best Answer that tells you exactly what to do. When you followed the link in that post what did you see? As a reminder, a link on a web page is a way to open a new page with additional information. A Link is usually shown as blue text, and to open the new page position your mouse cursor anywhere within the blue text (the mouse cursor will turn into an hand) and click the left mouse button. Let me try to make it perfectly clear:
CLICK HERE
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CLICK HERE—>How to create a new Apple ID - Apple Support<—CLICK HERE
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CLICK HERE