How to deactivate this manually?

[1master1]

Thanks for the suggestions. I had found that it is the problem with the server as it went out of disk space for phpmyadmin. Now it is working fine.

I lost my mind as i thought its a big problem occured after installing everything and i cant access the plugins, settings in ACP and phpMyAdmin. For a while i thought of deleting the DB and installing again. I had made this question at mybb too and got a quick response, so i didnt done anything and waited to contact the server admin.

Finally everything is resolved.