[Migi]

When logging into a server, my screen starts to flash and i cant see where i am on the map. I can type into the chat box and thats about it. I'm trying to figure out what and where do i put "Addplayerclass" because thats what i see people telling others to do when i searched this problem up? I dont know what folder "Addplayerclass" is in, if you have to put it in a folder. Please help! I'll add a pic to show what it looks like, but of course it flashing white.