i'm at work, so i'm really half assing these. Just to kill time.
The forum do not allow images in signature. You have to design signature in bbcode. Please read OP carefully, as ajareselde pointed out a few posts above you.
The exchange is looking for forum user signatures,in order to promote their exchange,so it should be in bbcode format, not a banner image.
You are both correct. However to save time for people taking part we will select the winner just by the image and then they will have to provide the bbcode format before their account is credited.