It's in the offer details section of the card on CO.com:
-FLEXIBLE ELITE QUALIFICATION MILES: You will earn 1,000 Flexible Elite Qualification Miles (Flex EQMs) for each $5,000 of eligible net purchases. Flex EQMs are not valid for reward travel or rewards. Flex EQMs can only be used toward attaining levels that are explained and defined in the Elite Qualification Requirements section of continental.com, as such may be amended from time to time. Flex EQMs earned on the Continental Airlines Presidential PlusSM Card account do not expire as long as your OnePass account remains open, and must be actively redeemed at continental.com or by contacting the OnePass Service Center. Flex EQMs will only be reported on customers’ OnePass statements and not their corresponding credit card statement.
-There is no maximum number of OnePass miles and Flex EQMs that you can accumulate in the Continental Airlines Credit Card program.