Setting data of one class from within another class

I am trying to set the attendance of students based on user input. Where I run it to the problem is trying to take that input and assign it to my data on each student.

All the data I have is read from a file in to a singly linked list. The struct for this data type is declared in my node.h.

So what I'm asking is how would I modify the values that originate from the Node class, within my menu class?

Menu.cpp

   void Menu::chooseMenu(ifstream *input, List L1)
{
    data temp;
    //data plswork[12];
    char holder[30];
    char junk[30];
    int i=1,j=1;

    do{
    system("cls");
    cout<<"1. Import"<<endl;
    cout<<"2. Load Master"<<endl;
    cout<<"3. Store Master"<<endl;
    cout<<"4. Mark Absence"<<endl;
    cout<<"5. Generate Report"<<endl;
    cout<<"6. Exit"<<endl;
    cout<<""<<endl;
    cin>>selection;

    if(selection == 1)//import
    {
        while(!input->eof())
        {
            memset(holder,0,30);

            if(i==3 && j != 1)
            {
                input->getline(holder,30,'"');
                input->getline(holder,30,'"');
                input->getline(junk,30,',');
            }
            else
            {
                input->getline(holder,30,',');
            }

            if(i==1)
            {
                strcpy(temp.record, holder);
                //cout<<temp.record<<endl;
                i++;
            }
            else if(i==2)
            {
                strcpy(temp.ID, holder);
                //cout<<temp.ID<<endl;
                i++;
            }
            else if(i==3)
            {
                strcpy(temp.name, holder);//read between quotes
                //cout<<temp.name<<endl;
                i++;
                j=2;
            }
            else if(i==4)
            {
                strcpy(temp.email, holder);
                //cout<<temp.email<<endl;
                i++;
            }
            else if(i==5)
            {
                strcpy(temp.units, holder);
                //cout<<temp.units<<endl;
                i++;
            }
            else if(i==6)
            {
                strcpy(temp.major, holder);
                //cout<<temp.major<<endl;
                i++;
            }
            else if(i==7)
            {
                strcpy(temp.grade, holder);

                //cout<<temp.grade<<endl;
                L1.insertOrder(temp);
                i=1;
            }

        }
    }

    else if(selection == 2)//load master
    {

    }

    else if(selection == 3)//store master
    {

    }

    else if(selection == 4)//mark absence
    {
        while(L1.nextPtr() != NULL)
        {
        char name;
            cout<<"Bruce :"<<L1.getDataL().absent<<endl;
            cout<<"Is "<<L1.getDataL().name<<" present? (Y/N)"<<endl;
            cin>>name;
            if(name == 'y' || name == 'Y')
            {
                L1.setAtt(L1.getDataL(),1); // This is where I try to set attendance to 0 or 1. 
                cout<<L1.getDataL().absent<<endl;
            }
            else
            {
                L1.setAtt(L1.getDataL(),0);
            }

            L1.nextPtr();
            system("pause");
        }
    }

    else if(selection == 5)//gen report
    {

    }

    }while(selection != 6);

}

Node.cpp

#include "Node.h"

ListNode::ListNode (ListNode &copyObject)
{
    this->mData = copyObject.mData;
    this->mpNext = copyObject.mpNext;
}

ListNode::~ListNode ()
{
    // does nothing
    cout << "exiting listnode object - going out of scope" << endl;
}

ListNode * ListNode::getNextPtr () const
{
    return mpNext;
}

data ListNode::getData() const
{
    return mData;
}

ListNode::ListNode(data newData)
{
    mData = newData;
    this->mpNext = NULL;
}