Is possible custom title???

Yes, you can set whatever font-size you wish for .ytc_title element class. Just add couple lines of custom CSS.

Cheers,
Aleksandar

Great! But where add the element?

Simply wrote custom CSS for this and add it to one of following:

1. Child theme style.css
2. Custom CSS in WordPress 4.7+ Customizer
3. To theme’s CUstom Styling section (if exists), or
4. To our Head & Footer Code plugin