How do i pre-populate Django ModelForm fields

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This form requires a student to login before filling it out. I want the input field with placeholder Enter Your Username to be pre-populated with the username of the individual filling it out.

Here is my models.py

class User_detail(models.Model):
    username = models.CharField(max_length=255, default="")
    first_name = models.CharField(max_length=255, default="")
    last_name = models.CharField(max_length=255, default="")
    email = models.EmailField(max_length=255, default="")
    date_of_birth = models.DateField(null=False, blank=False, default="")
    gender = models.CharField(max_length=50, choices=GENDER, default="")
    tel = PhoneNumberField()

    def __str__(self):
        return self.email

Here is my views.py

from django.contrib.auth.decorators import login_required
from .forms import *

def signin(request):
    if request.user.is_authenticated:
        return redirect(profile)
    if request.method == "POST":
        form = Signin(request.POST)
        if form.is_valid():
            username = request.POST["username"]
            password = request.POST["password"]

            user = auth.authenticate(username=username, password=password)

            if user is not None:
                auth.login(request, user)
                return redirect("profile")
            else:
                messages.error(request, "Invalid credentials")
                return redirect("signin")
    else:
        form = Signin()
        return render(request, "accounts/login.html", {"form": form})


@login_required(login_url="signin")
def user(request):
    if request.method == "POST":
        form = Userdetail(request.POST)
        if form.is_valid():
            user = form.save(commit=False)
            user.save()
            messages.success(request, "You Have Successfully updated your details")
            return render(request, "thanks.html")
    else:
        form = Userdetail()
    return render(request, "accounts/User details.html", {"form": form})

Here is my Forms.py

class Signin(forms.Form):
    username = forms.CharField(
        max_length=255,
        widget=forms.TextInput(attrs={"placeholder": "Enter Your Userame"}),
    )
    password = forms.CharField(
        max_length=255,
        widget=forms.PasswordInput(
            attrs={"placeholder": "Enter Your Password", "id": "password"}
        ),
    )


class Userdetail(forms.ModelForm):
    class Meta:
        model = User_detail
        fields = "__all__"
        widgets = {
            "first_name": forms.TextInput(
                attrs={"placeholder": "Enter Your First Name"}
            ),
            "last_name": forms.TextInput(attrs={"placeholder": "Enter Your Last Name"}),
            "other_name": forms.TextInput(attrs={"placeholder": "Enter Other Names"}),
            "email": forms.EmailInput(
                attrs={"placeholder": "Enter Your E-mail Address"}
            ),
            "date_of_birth": forms.DateInput(attrs={"type": "date"}),
            "gender": forms.RadioSelect(attrs={"type": "radio", "class": "gender"}),
            "tel": forms.TextInput(attrs={"placeholder": "Enter Your Phone Number"}),
            'username':forms.TextInput(attrs={'placeholder': 'Enter Your Username'}),
        }

    def clean(self):
        super(Userdetail, self).clean()
        tel = self.cleaned_data.get("tel")
        email = self.cleaned_data.get("email")

        for instance in User_detail.objects.all():
            if instance.email == email:
                self.errors[""] = self.error_class(["E-mail already in use"])
            elif instance.tel == tel:
                self.errors[""] = self.error_class(["Phone Number already Exists"])

So what i am basically trying to achieve is that i want the username input field to be pre-poulated by username of the student that login to fill the form.

You can use the initial argument for the form to set up default field values (see docs). So something like this should work:

def user(request):
else:
    form = Userdetail(initial = {'username': request.user.username})
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