Same nick/mail and same pasword, if not, try to contact with their support team, they are quite quick and efficient people
It was my mistake: although initially when I registered it didn't show the badges for participating in previous campaigns, I later looked at my profile and they are there.
xD It's me, don't panic. xD I don't know what happened. I was trying to register with my PC and I couldn't. I tried with my smartphone, and it let me...