MyBB Community Forums

I enter username and password...thank you for login, refresh page, and nothing still guest, not logged in...

http://ummet.com.ba/forum/

Can I fix this?

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Insane!

try using ummet.com.ba as cookie domain and / (slash) as cookie path

you can first change them in ~/inc/settings.php file and then at
Site Details page of Configuration section in forum admin panel.

see also related guidance => MyBB faq: login