¿how to change the size and space between letters of the header?

Hi, Your original post was never closed, it’s still open and available for your reply – http://appfinite.com/topic/how-to-change-the-size-and-space-between-letters-of-the-header/

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I’m not sure which part of the header you’re referring to (logo or menu) so I’ll give you an answer for both –

To increase or decrease the spacing between letters in the logo area you can either adjust the .site-title a in your style.css or add this to your Custom CSS page in the Customizer –

.site-title a {
    letter-spacing: 1px;
}

To adjust the spacing for the Menu section, add or adjust this –

.genesis-nav-menu a {
    letter-spacing: 2px;
}

The code for the menu is currently on line 1304 in your style.css and is already set to 2px by default. You can adjust this by adding the above code in your Custom CSS page, or you can adjust it directly in your style.css. Here’s what it looks like by default –

.genesis-nav-menu a {
    color: #fff;
    display: block;
    font-size: 13px;
    font-weight: 300;
    letter-spacing: 2px;
    padding: 30px 15px;
    text-transform: uppercase;
}

Let me know if that helps.