In ES File Explorer I found out how to check if file is r/w (I think). Under hosts properties the permission is RWX RWX RWX. I looked at the change page and all the boxes are checked for read, write, and execute. Each category has three boxes checked- user, group, & other. I cannot find out what I need to do next. I again tried to delete all the lines but the first one but I received the message Error file cannot be saved. I tried a couple of times but it was always the same. Any suggestions?