Edit Object in Vector and return Vector

I am new to programming. I am trying to make a Banking application, where a User enters their name and gets a Username set.
I am messing around with Classes for the first time.

1. I am trying to pass a std::vector to a function to add Data into it. Do I have to return the values that I want to set into the Vector? Or can I just edit the Vector in the subfunction, since a Vector is stored on the Heap?

2. How can I modify the Attributes of an Object in a Vector?

   MEDevel.com: Open-source for Healthcare and Education

   Collecting and validating open-source software for healthcare, education, enterprise, development, medical imaging, medical records, and digital pathology.

   Visit Medevel

class Account {int something{}; };
Account Frank;
Frank.something =....

How can I do that in Vectors?

>Solution :

You can pass a non-const reference of your vector to your function, e.g.

void add_value(std::vector<int>& values, int value) {
    values.push_back(value);
}

// later
std::vector<int> values;
add_value(values, 5);
// values now contains {5}

If you have a vector of objects you can first index one of them, then call a method or attribute

std::vector<Account> accounts;
// ... gets filled ...
accounts[i].do_something();  // call method
accounts[i].name;  // access public member