need help plz!!!!!

hello peeps is there any one who could help me my son has been playing on a online game called conquer online and someone keeps hacking into his account we know the name of the person and we have put protection onto the account but can anyone tell me how he is doing it plz cause he needs just deserts !!!! many thank for anyone who reads and helps me thanks

 

so this game is on a computer and hacking is pretty complicated.

 

firewall also get a hold of the tech support of the site your son is at, good luck