I blog a lot about playing on CarbonPoker.com, the most popular portal to the Merge Network. If you decide to join, please use my link to the right. Carbon started their own Bad Beat Jackpot last year and it has reached a record payout. There are many table formats available, from limit to the most popular and heavily played No Limit.
Please read their rules, but I will explain them. On a qualifying table, easy to identify, there must be at least 5 players that are dealt cards preflop. Someone must lose with quad 7's or better. Both the losing and winning hands must use both of their hold cards. The hand must go to the river. Everyone dealt cards wins something, with the losing hand winning the most from the jackpot.
If you are already a member, but just playing freerolls, this is the time to become a real money player by making a deposit and finding a table that works for you under their structure. The limit tables are a great way to participate with smaller bankrolls so everyone can play.
Good luck!