I tried to sign up to the site but I don’t received the confirmation email
It looks like you found it as I can see you’re in the usergroup for members who have validated their email address but haven’t reached the requirements to have their posts auto-approved yet.
How can I solve this problem?
You’re fine. Since that was posted you’ve been moved to the regular registered users group with most of the account restrictions removed. The few restrictions you have will automatically lift when you have enough posts and have been registered long enough. The features you currently don’t have are rarely used ones anyway so you probably won’t even notice when they do become available