It keeps saying it's over the 6KB limit. The flag's very simple and I don't know how I could make its size smaller. Can this be helped, or should I stay with the default flag?
If its made in Photo Shop, make sure you save the imge as a JPEG or GIF i think it is. You might have saved it with the format that still has the layers on it.
Hope I helped. :D
.GIF is better for designs with just a few colours.
Also, make sure the flag is smaller than 5.5kb - the NS server uses Unix, so 6kb for the server is different to 6kb on your computer.