go to profile tab

Look on left table , the second one ( Modify Profile )

click "Forum Profile Information"

then you will see personal text  fill it with
The campaign will pay you 2500 satoshi or BTC 0.000025 / post  (min 20 post per week )* if you join other sig campaign


*note : I'm processing payout right now  

Payout has been made

https://blockchain.info/tx/24a72bcf9e95aebd3b032bd3dbad03bef36f233f7414c38dd6df9ee45fbd9225