Radarr/UI/Settings/Indexers/CollectionTemplate.html

<fieldset>
    <legend>Indexers</legend>

    <div class="row">
        <div class="span12">
            <button class="btn btn-success x-add">Add Newznab</button>
        </div>
    </div>

    <div class="row">
        <div class="span12">
            <ul id="x-indexers" class="indexer-list"></ul>
        </div>
    </div>
</fieldset>