app/web/views/profile_tags.erb
<form action="/tags" method="post">
<label class="label" for="tag">Add your own</label>
<div class="field has-addons">
<div class="control">
<input type="hidden" name="handle" value="<%= profile.handle %>"/>
<input class="input" type="text" name="tag" id="tag"/>
</div>
<div class="control">
<button type="submit" class="button is-primary">
<span class="icon is-small">
<i class="mdi mdi-plus"></i>
</span>
</button>
</div>
</div>
</form>