You can request your unpaid money if it exceeds the preferred check size you have chosen when becoming a member. If you don't reach your preferred check size in a given month, your earnings are transferred to the next month.
The Request Payment button is available between the 1st and 15th of the month on My Statistics page. Your money will be sent to you by check or PayPal - depending on your preferred payment method. In order to get paid on time, make sure you provide a valid mailing address/PayPal address upon registration. Your current payment statistics with detailed explanations are available on My Statistics page.
Related Questions:
Q: What are my potential earnings as a member?
Q: When can I request my check?
Q: How long does it take to get paid after I request my payment?
Q: How do I get paid?
Q: What fees will I pay to receive my payment?