To create a radio buttons:

<form>
  <div>
    <input type="radio" name="membership" id="silver" />
    <label for="silver" class="label-inline">Silver</label>
  </div>

  <div>
    <input type="radio" name="membership" id="platinum" />
    <label for="platinum" class="label-inline">Platinum</label>
  </div>
</form>

Note: you can also use checked and disabled on the button:

<div>
  <!-- This button is pre-selected and disabled -->
  <input type="radio" name="membership" id="silver" checked disabled />
  <label for="silver" class="label-inline">Silver</label>
</div>