Add custom button to django admin panel

I want to add button to admin panel to my model, I have overwrite template (path: templetes/admin/myapp/mymodel/change_list.html)

change_list.html

{% extends "admin/change_list.html" %}
{% load i18n admin_static %}

{% block result_list %}
<div class="object-tools">
    <a href="{% url 'myurl' %}" class="btn btn-high btn-success">Import</a>
</div>
{{ block.super }}
{% endblock %}

In admin.py

class ImportAdmin(admin.ModelAdmin):
    change_list_template = 'admin/myapp/mymodel/change_list.html'

But I can not see the button.

It works as below ("Import" button right side).

Django = 1.11

admin/change_list.html: Add the URL with "admin:". Otherwise, it will not resolve the URL.

{% extends "admin/change_list.html" %}
{% load i18n admin_static %}

{% block object-tools-items %}
{{ block.super }}
<li>
    <a href="{% url 'admin:myurl' %}" class="btn btn-high btn-success">Import</a>
</li>
{% endblock %}

admin.py: Add the custom template URL

class ImportAdmin(admin.ModelAdmin):
    change_list_template = 'admin/myapp/mymodel/change_list.html'

Django >1.8

settings.py: TEMPLATE_LOADERS deprecated. Set TEMPLATES as below.

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [os.path.join(BASE_DIR, 'templates')],
        'APP_DIRS': False,
        'OPTIONS': {
            'context_processors': [
                'django.template.context_processors.debug',
                'django.template.context_processors.request',
                'django.contrib.auth.context_processors.auth',
                'django.contrib.messages.context_processors.messages',
            ],
            'loaders': [
                'admin_tools.template_loaders.Loader',
                ('django.template.loaders.cached.Loader', [
                    'django.template.loaders.filesystem.Loader',
                    'django.template.loaders.app_directories.Loader',
                ]),
            ],

        },
    },
]