Run this in your compiler and see the problem bc it looks fine.

#include <iostream>
#include <ctime>
#include <string>
#include <cctype>
#include <cstdlib>
#include <vector>
using namespace std;

int main()
{
    cout << "Enter your name." << endl;
    string name;
    cin >> name;
    cout << "Welcome " << name << endl;
    char arr[10];
    cout << "Enter your username, Make sure it's 10 characters long." << endl;
    cin >> arr;
    string H = "JacksonFive";
    cout << endl;
    string password;
    cout << "Enter Random for random password, enter anything else to get to choose your password" << endl;
    cin >> password;

    if (password == "Random") {
        string data = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
            "abcdefghijklnmopqrstuvwxyz"
            "1234567890";
        string pass;
        for (int i = 0; i <= 8; i++) {
            pass = pass + data[rand() % data.length()];
        }
        cout << endl;
        cout << "Your Username: " << arr << endl << "Your Password: " << pass << endl;
    }
    else {
        cout << "Enter your Password, Make sure it's 8 characters long and make sure there is no tilde~";
        string P;
        cin >> P;
        
        cout << "Your Username: " << arr << endl << "Your Password: " << P << endl;
    }
    cout << "Please login to ensure your account is safe from termination." << endl;
    int logatt = 0;
    string usern;
    string userp;
    while (logatt < 5) {
        cout << "Enter your username." << endl;
        cin >> usern;
        if (usern == arr) {
            cout << "Enter your password." << endl;
            cin >> userp;
            if (userp == password) {
                cout << "Show home screen" << endl;
            }
            else {
                cout << "Try again" << endl;
                logatt++;
            }
        }
        else {
            cout << "Try again" << endl;
            logatt++;
        }
    }


 

    return 0;
}