Hi Milton,
Apologies for the misunderstanding.
There is no option for changing the font type in the free version. However, we can provide you CSS for the font size for both the heading and subheading
/* For heading */
.slide-bg-section h1 {
font-size: 35px;
}
/* For Sub heading */
.slide-bg-section p {
font-size: 20px;
}
Copy and paste it in Appearance -> Customize -> Additional CSS
Note: Change the number according to the requirements.
Best Regards