No one will place your ads without payment at first but you have to wear signature for one week and then get payed.
As mentioned, campaign ended. On another hand we all know what is yobit, promoting a shady exchanger isn't a good way. They were fair with campaign users when it was open recently but at the same time a company which doesn't let some of it's customers to withdraw, why won't just ignore sig campaign participants? (in future) Once you are shady, you'll keep using moments and be shady again.