Desktop:

Use this code:

<div class="ultimate-currency" style="display:inline-block;margin-left:5px;margin-top:-2px;"></div>

Place it inside the header.liquid file in line 127:

Mobile:

We are going to add it inside the menu >

Use this code:

<div class="ultimate-currency" style="display:inline-block;margin-left:14px;margin-bottom:10px;"></div>

Place it inside the mobile-nav.liquid file in line 100:

Click "Save".

Test it in your store.