How to overwrite on my django models

Using Django
7

@KenWhitesell I rewrite the code little bit with the help of this Link.

Now this is my code
views.py

def EditProfile(request):

    if request.method == 'POST':

        username = User.objects.get(username)
        email = request.POST.get('id_email')
        auth = request.POST.get('D_Auth')
        chid = request.POST.get('D_ChID')
        utyp = request.POST.get('U_Type')
        loss = request.POST.get('N_Loss')

        if loss == 'on':
            flos = True
        else:
            flos = False

        if username is None:
            messages.success(request, 'You must enter Username')
            return redirect('edit_profile')

        elif email is None:
            messages.success(request, 'You must enter Email')
            return redirect('edit_profile')

        elif User.objects.filter(username=username).exists():
            messages.success(request, 'Username is already taken')
            return redirect('edit_profile')

        elif User.objects.filter(email=email).exists():
            messages.success(request, 'Email is already Taken')
            return redirect('edit_profile')

        elif auth is None:
            messages.success(request, 'Authentication Key Must be Entered')
            return redirect('edit_profile')

        elif chid is None:
            messages.success(request, 'Channel ID Must be Entered')
            return redirect('edit_profile')

        elif UserAuthentication.objects.filter(D_Auth=auth).exists():
            messages.success(request, 'Authentication key in Use')
            return redirect('edit_profile')

        else:
            user = User.objects.get(username=user)
            userauth_obj = UserAuthentication.objects.update(
                U_User = user,
                defaults = {
                    "D_Auth": auth,
                    "D_ChID": chid,
                    "U_Type": utyp,
                    "N_Loss": flos,
                }
            )
            user_obj = User.objects.update(
                defaults = {
                "username": username,
                "email": email
                }
            )

    return render(request, 'registration/edit_profile.html')

edit_profile.html

{% extends "index.html" %}
{% block content %}

<div class="container">
        <form method="post" class="form" id="form">
        {% csrf_token %}

        <h1>Register</h1>

        {% if messages %}
            {% for message in messages %}
                <div class="alert alert-info">
                    {{ message }}
                </div>
            {% endfor %}
        {% endif %}

        <div class="form-group">
            <label for="username">Username</label>
            <input type="text" name="username" id="username" class="form-control">
        </div>

        <div class="form-group">
            <label for="id_email">Email ID</label>
            <input type="text" name="id_email" id="id_email" class="form-control">
        </div>

        <div class="form-group">
            <label for="D_Auth">Discord Authentication Key</label>
            <input type="text" name="D_Auth" id="D_Auth" class="form-control">
        </div>

        <div class="form-group">
            <label for="D_ChID">Discord Channel Id</label>
            <input type="text" name="D_ChID" id="D_ChID" class="form-control">
        </div>

        <div class="form-group">
            <label for="U_Type">Player Type</label>
            <select name="U_Type" id="U_Type" class="form-control">
                <option value="Normal">Normal Player</option>
                <option value="Patron">Patron Player</option>
            </select>
        </div>

        <div class="form-group">
            <label for="N_Loss">No Loss</label>
            <input type="checkbox" name="N_Loss" id="N_Loss" class="form-control">
        </div>

        <button class="btn btn-success mt-3" type="submit">Submit</button>

        <a href="{% url 'register' %}">Create a Account</a>
        <a href="{% url 'forgetpass' %}">Reset My Password</a>

        </form>
</div>

{% endblock content %}

And now i want to show the details of the user in the corresponding fields in the page.