.ol-class {
  list-style-type:decimal;
}

.dt {
  display:table;
}

<ol class="ol-class">
  <li><div class="dt">Open app.</div></li>
  <li><div class="dt">Tap on your avatar on bottom right corner.</div></li>
  <li><div class="dt">Tap on icon on upper left corner.</div></li>
</ol>