SoftballGenius3

Hello, so i was playing around with my server and i installed the TAB REBORN plugin. i didnt undersatnd how to put in the ping and the mcmmo levels so i deleted those parts of config. it worked but then there was still a long like (%players_mcmmo_level%) or somthing next to every players name. i then thought i was deleting that part but instead it deleted the [rank] prefix before each players name. and i couldnt figure out how to get everything i deleted back. so i thought maybe i could just delete the plugin and it would reset so i tried to do that but i couldnt delete the folder so i deleted all the files inside. when i tried to reinstall the pluggin the folder would still be empty. how do i get the files back and how do i reset the files?