I HAVE DONE THE SURVEYS FROM VALUED OPINIONS HOW DO I CLAIM MY VOUCHERSs?

I HAVE GOT �5.20 ON MY VALUED OPINIONS ACCOUNT, AND I WOULD LIKE TO CASH IT IN FOR THE VOUCHERS, . I HAVE DONE IT BEFORE BUT I HAVE FORGOTTON HOW TO DO IT. I ALSO HAVE �5 OF PENDING REWARDS. YOU ONLY NEED �5 FOR THE ARGOS VOUCHERS WHICH I HAVE CHOSEN.