you need firstly, to reach a full member status at least, then you can join one of those signature campaign and start earning, but read te rules first, not all section are allowed
be patient and up your rank first, then choose one of these signature campaign you want...
that's may good option...,
it is very long, the better he bought the account, at a price between 0.05 - 0.1 and in 1 or 2 weeks of money he could return