C :: How To Insert A Node Into Linked List At Particular Location Based On Time

I'm trying to figure out how to insert a node into a linked list at a particular location based on a time..I have this declared outside of everything globally.

Code:

struct aTime {
char name[LENGTH];
int time;
struct aTime* next;
};

struct aTime* head = NULL; And then this function that is used to add nodes (aTime structs) to a linked list. It adds the first node fine, but not subsequent ones. I think this is because I have while p-> != NULL but it is always going to be null when the function is called since I create a new aTime struct. So I guess my question is how, after one struct has been added at the beginning, do I point to the head node and traverse the list, insert a node, and make sure everything is still linked? Do I need another temp aTime struct?

Code:

void add_time(char name[LENGTH], int seconds)
{
struct aTime *p;
p = (struct aTime *) malloc(sizeof(struct aTime));
if (head == NULL)
{
strcpy(p->name, name);
p->seconds = seconds;
}

[code]....