Linked List adding node

What is wrong with the code... y can't i add another data all i can add is 1 data

int addnode(Node *head,Node *ptrnode,Node *prevnode)
{

prevnode->link=ptrnode;
ptrnode->link=NULL;


prevnode=ptrnode;
ptrnode=(Node *)malloc(sizeof(Node));

printf("Input Your Firstname : ");
scanf("%s",&(ptrnode->individual.firstname));
printf("Input Your Surname : ");
scanf("%s",&(ptrnode->individual.surname));
printf("Input Your Gender : ");
fflush(stdin);
scanf("%c",&(ptrnode->individual.gender));
printf("Input Your Age : ");
fflush(stdin);
scanf("%d",&(ptrnode->individual.age));
printf("Input Your balance : ");
scanf("%f",&(ptrnode->individual.balance));

prevnode->link=ptrnode;
ptrnode->link=NULL;


return 0;
}

Code:

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int addnode(Node *head,Node *ptrnode,Node **prevnode)
{
  ptrnode=(Node *)malloc(sizeof(Node));
  (*prevnode)->link = ptrnode;
  (*prevnode) = ptrnode;
  ptrnode->link = NULL;

  printf("Input Your Firstname : ");
  scanf("%s",&(ptrnode->individual.firstname));
  printf("Input Your Surname : ");
  scanf("%s",&(ptrnode->individual.surname));
  printf("Input Your Gender : ");
  fflush(stdin);
  scanf("%c",&(ptrnode->individual.gender));
  printf("Input Your Age : ");
  fflush(stdin);
  scanf("%d",&(ptrnode->individual.age));
  printf("Input Your balance : ");
  scanf("%f",&(ptrnode->individual.balance));

  return 0;
}

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