[Plugin: Pie Register] Custom Logo not working

I’ve tried all the possible extensions for a logo i.e., jpg,png,gif and have unchecked ‘Organise my…’ from Misc Options and set permissions for wp-content/uploads to 0777. I tried using FireFox, IE, Chrome and still can’t get it working. Is there anywhere(wp-content/uploads or DB) I can insert the logo directly with a specific name?