Add another social icon to the social bar

Hello everyone,
sorry for my English.

I use the Byblos theme, which does not include predefined social icons for Youtube, and I would like to add it.

I thought I had to modify the php file of the theme, but I do not understand how, because I do not have great knowledge about code. Not so great to be able to make a change of the genre, actually.

So, I attach the div that needs to be modified

<div class="social-bar">
                
                <h3><?php echo $byblos_options['social_title']; ?></h3>
                
                <?php if ( '' != $byblos_options['sc_facebook_url'] ) : ?>
                    <a href="<?php echo esc_url( $byblos_options['sc_facebook_url'] ); ?>" target="_blank" class="icon-facebook">
                        <i class="fa fa-facebook"></i>
                    </a>
                <?php endif; ?>
                
                <?php if ('' != $byblos_options['sc_pinterest_url'] ) : ?>
                    <a href="<?php echo esc_url( $byblos_options['sc_pinterest_url'] ); ?>" target="_blank" class="icon-pinterest">
                        <i class="fa fa-pinterest"></i>
                    </a>
                <?php endif; ?>
                
                <?php if ('' != $byblos_options['sc_instagram_url'] ) : ?>
                    <a href="<?php echo esc_url( $byblos_options['sc_instagram_url'] ); ?>" target="_blank" class="icon-instagram">
                        <i class="fa fa-instagram"></i>
                    </a>
                <?php endif; ?>
                
                <?php if ('' != $byblos_options['sc_soundcloud_url'] ) : ?>
                    <a href="<?php echo esc_url( $byblos_options['sc_soundcloud_url'] ); ?>" target="_blank" class="icon-soundcloud">
                        <i class="fa fa-soundcloud"></i>
                    </a>
                <?php endif; ?>

                <?php if ('' != $byblos_options['sc_twitter_url'] ) : ?>
                    <a href="<?php echo esc_url( $byblos_options['sc_twitter_url'] ); ?>" target="_blank" class="icon-twitter">
                        <i class="fa fa-twitter"></i>                            
                    </a>
                <?php endif; ?>

                <?php if ('' != $byblos_options['sc_linkedin_url'] ) : ?>
                    <a href="<?php echo esc_url( $byblos_options['sc_linkedin_url'] ); ?>" target="_blank" class="icon-linkedin">
                        <i class="fa fa-linkedin"></i>                            
                    </a>
                <?php endif; ?>

                <?php if ('' != $byblos_options['sc_gplus_url'] ) : ?>
                    <a href="<?php echo esc_url( $byblos_options['sc_gplus_url'] ); ?>" target="_blank" class="icon-gplus">
                        <i class="fa fa-google-plus"></i>                            
                    </a>
                <?php endif; ?>

            </div>

I think there is not only this to be modified.
I am looking for a solution to this, but I am also open to new and imaginative solutions.

Thank you :*