I cant' post when i ready post in the first board
If you are meaning "I cannot post when I read the first post in this forum" that is because it is locked. (http://www.sencha.com/forum/showthre...ases-amp-Notes)
That means it is an informative post which is not intended to start conversations within it. If you want to ask a question, click on 'Post New Thread' on the right hand side. If you are having trouble answering another persons question then ensure you are clicking 'Reply to Thread' and then clicking 'Post Quick Reply' directly under the response you have typed in.
Some replies have to be confirmed by a moderator, most likely to prevent spamming. That means there may be a delay before it is visible.