c++ - How to implement functions with container list -

i'm learning container list. , want write function replace (element on index), insert (element on index), , want know how delete them. i'm learning 2 day watched videos , read articles don't know how write code. know how list work's pointers.

this how imagined (it start)

void replace(list<contact> &listof, int index, const contact &information) {      for(list<int>::iterator = listof.begin(); != listof.end(); it++){      } } 

i don't know if loop writen right, imagined go through list , if finds index wants replace juse overwrite.

i think function insert has same parameters.

and how imagined delete i'm not quit sure how implement.

contact delete(list<contact> &listof, int index) {  } 

i have created strutcture of contact name , surname both string on start of program.

the loop should written

for (list<contact>::iterator = listof.begin(); != listof.end(); ++it) {     wan't *it. }