C++ :: Pointers To Array Of Structs

I have an assignment where I need to use pointers to do a few things and I am a little confused on the syntax of it all. My question is how do you use a pointer to point to an array of structs.

For example

struct info{
char firstName[15];
char lastName[15];
};
main() {
info person[4];
cout << "The third letter of the second persons first name is: "; // ?????
}

how would I define a pointer to point to the third letter of first name the second person in the "person" array.