SEO Question | Put H2 and H3 Tag in Menu Bar Titles

[MysticalQuartz]

So, I want to do something like this

<h2>My Menu</h2>
<h3>Submenu 1</h3>
<nav>
    <ul>
        <li><a href="#">Link 1</a></li>
        <li><a href="#">Link 2</a></li>        ...
    </ul>
</nav>

 But I cant find where is this code in my theme. I'm using Supply and my website is https://mysticaltienda.com/

Anyone can help me?

[Josh_Uebergang]

Use the Bold's Chrome extension to search for code in your theme. Search for "site-nav--link" in the extension search bar to find where your menu is.

[MysticalQuartz]

Did not work. It seems that extension don't works anymore.