Want to buy a ticket for 2 person adult and one kids below 130cm.

Regards. I have a plan to take this cruise boat on 30 December 2019. Could you give me some information about it, if i booking online from this china travel guide then how do i redeem the ticket and what should i do after that? I will travel there with my wife and my son(below 130cm). I 'll stay around dongsi station. Could you tell me how to go to the wharf from my place and what subway metro should i take? Would you please inform me and do you have any contact email so i can ask more question. Tq