also i got now domain link like this :
http://forum.domain//index.php
--------------- Added [DATE]1453923820[/DATE] at [TIME]1453923820[/TIME] ---------------
Fixed by myself

Basically i had redirections on my hosting panel so that was brake my website . Because I changed URL settings but I got there redirections , so that was causing problems on login admincp and forum. How I was fixed ?
1. I deleted all redirections from my hosting panel.
2. Changed URL settings via phpmyadmin , you can find it on setting tabel , on page nr 2 and nr 4,
3. Made new redirections but an other ways
That's all