Insertion into Linked List after an element specified by user in C++/C

#include<iostream>
using namespace std;

struct node
{
int info;
node *link;
};

void insertFirst(node **start,int num)
{
node *temp=new node;
temp->info=num;
temp->link=NULL;
*start=temp;
cout<<"First:\n";
}

void insertLast(node *start,int num)
{
node *temp=new node;
temp->info=num;
temp->link=NULL;
while(start->link!=NULL)
{
start=start->link;
}
start->link=temp;
}

void insertAtPos(node *start,int num,int num1)
{
node *temp=new node;
temp->info=num1;
temp->link=NULL;
node *prev=start;
while(start!=NULL)
{
if(start->info==num)
break;
else
prev=start;
start=start->link;
}
temp->link=start->link;
start->link=temp;

}

void disp(node *start)
{
while(start!=NULL)
{
cout<<" "<<start->info;
start=start->link;
}
}




main()
{
node *start=NULL;
insertFirst(&start,1);
insertLast(start,2);
insertLast(start,3);
insertLast(start,4);
insertLast(start,5);
insertAtPos(start,2,6);
disp(start);
}