hugo-cms/templates/sites/settings.html

<form method="POST" action="/sites/{{.site.ID}}/settings">
  <p>
    <label>Title</label>
    <input type="text" name="site_title" value="{{.site.Title}}" />
  </p>
  <p>
    <label>Theme</label>
    <select name="site_theme">
      {{range .themes}}
        {{if eq .ID $.site.Theme}}
          <option value="{{.ID}}" selected>{{.Name}}</option>
        {{else}}
          <option value="{{.ID}}">{{.Name}}</option>
        {{end}}
      {{end}}
    </select>
  </p>
  <p>
    <label>URL</label>
    <input type="text" name="target_url" value="{{.target.URL}}" />
  </p>
  <p>
    <label>Netlify Site ID</label>
    <input type="text" name="target_ref" value="{{.target.TargetRef}}" />
  </p>
  <p>
    <input type="submit" value="Save" />
  </p>
</form>