Is it a web safe font? See https://www.cssfontstack.com/ for a list. If so, add the following to style.css
body {
font-family: "Times New Roman", serif;
}
Replace Times New Roman with the font you want and serif with a generic font. See https://www.w3schools.com/cssref/css_websafe_fonts.asp for examples.
If it’s a Google font, create a file called functions.php in the bluesand-child folder. Copy and paste the following into functions.php:
<?php
/*
Bluesand Child Functions
*/
function bluesand_child_google_font() {
wp_enqueue_style( 'bluesand-child-google-font', '//fonts.googleapis.com/css?family=Roboto:400,400italic,700' );
}
add_action( 'wp_enqueue_scripts', 'bluesand_child_google_font' );
Then in style.css, add:
body {
font-family: 'Roboto', sans-serif;
}
Get the font url and font-family of your choice from https://www.google.com/fonts and change the code accordingly.