Q: problem to sign in Macbook Pro

You can call Apple since you have 90 days of free telephone support

https://www.apple.com/support/complimentary/

What do you mean by " After updating the page user "?

You can reset the admin PW by:

http://www.macobserver.com/tmo/article/os-x-mavericks-how-to-easily-reset-ther-a dministrator-password

What do you mean by "user page"?

When a Mac is set up it requires one to enter a username and password. That is for the administrator's account. One have to sign into an Administrator's account to do certain things on the Mac.