Recycle rented referral and Renew Rented Referral  

Suppose you have rented some referrals in this site. After few days of clicking you found that some of your rented referrals are not clicking the ads. So you are not getting the full benefit from those referrals. Now you can replace these referrals with new ones. It require a small fee for these replacement. So you can try with the new referrals. This is what is called 'Recycling' of referrals. "Renew' of referrals means you are extending the term of the existing referrals for one more month. The referrals are not changing here. Only their period of service is increased. Hope that you got the deference.

The person above has given you an answer for which you were looking for.
If you take my advice don't rent any referrals on any ptc site as they give only bots as a rented referrals which don't click regularly or they will stop clicking suddenly. Instead of this you should try and find some direct referrals.