[Python] I need to create a button in html

I have a Field and a button that changes a record in the Database when clicked. I want to not have this field, and when I press the button, I go to the already filled field, and I can customize it, and then save it by pressing the button.

Here is my code

today.html


<title>Todoist</title>
<h1>Сегодня</h1>
<h2>Задачи</h2>
<form method="POST" action="{% url 'todoist:add' %}" >{% csrf_token %}
<input type="text" name='tasks' pattern=".{2,}" required title='Минимум два символа!!!'>
<button type="submit" class="save btn btn-default">Добавить задачу</button>
</form>


{% for todo in todos%}
<div>
<p> {{todo.tasks}}</p>
<a href={% url 'todoist:delete' today_id=todo.id%}>Удалить</a>
<form action="{% url 'todoist:update' today_id=todo.id%}" method="post"> {% csrf_token %}
<input type="text" name='tasks'>
<button type="submit" class="save btn btn-default">Изменить</button>
</form>
</div>
{% endfor %}

views.py

from django.shortcuts import render,redirect
from .models import Today
from django.views.decorators.http import require_http_methods


def index(request):
todos = Today.objects.all()
return render(request, 'today.html', {'todos':todos})

@require_http_methods(['POST'])
def add(request):
tasks = request.POST["tasks"]
task = Today(tasks=tasks)
task.save()
return redirect('todoist:index')

def delete(request, today_id):
todo = Today.objects.get(id=today_id)
todo.delete()
return redirect('todoist:index')

def update(request, today_id):
todo = Today.objects.get(id=today_id)
todo.tasks = request.POST.get('tasks')
todo.save()
return redirect('todoist:index')

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