[Plugin: Minecraftstatuswidget] Can't delete widget manually/White screen

Hi, so i run a minecraft server and i decided to add a minecraft status checker. I installed the plugin and tried to active it and it gave me a blank(white) screen. I can’t access my website now and i tried deleting it manually but it wouldn’t let me. Also i tried CHMOD 777 but that was denied also. Don’t know what to do, don’t want to re-do my website 🙁
Help? website(www.dova.lt see for yourself.)