Chances are as a newbie you can not participate in signature bounty campaigns. This is because there is no space for signature link since you have not been upgraded. In most cases for you to be accepted, you must be a Jr member. You to be active and must have done up to 30 activities to be ranked so. As a newbie your best bet is to participate in other bounties like facebook and twitter campaigns.
I agree with you on that. As a newbie you have to work your way to increase your rank and gain merits to be able to rank up and be eligible to join any campaign. That is why every newbie has to do thier best to rank up, comtinue to contribute good quality post to gain merit.