blog2.0/blog/base/models.py

from django.db import models
from wagtail.admin.panels import FieldPanel
from wagtail.contrib.settings.models import BaseSiteSetting, register_setting
from wagtail.fields import RichTextField


@register_setting
class SiteSettings(BaseSiteSetting):
    title = models.CharField(max_length=32, blank=True)
    logo = models.ForeignKey(
        "wagtailimages.Image",
        on_delete=models.CASCADE,
        related_name="+",
        null=True,
        blank=True,
    )
    footer = RichTextField(blank=True)

    panels = [
        FieldPanel("title"),
        FieldPanel("logo"),
        FieldPanel("footer"),
    ]