I figured it out. Found this on the Github page (https://github.com/TheCraigHewitt/Seriously-Simple-Podcasting/issues/122) and modified for my needs.
add_filter( 'ssp_feed_channel_link_tag', 'philoushka_custom_feed_channel_link_tag', 10, 2 );
function philoushka_custom_feed_channel_link_tag ( $url = '', $series_slug = '' ) {
if( $series_slug ) {
$url = get_term_link( $series_slug, 'series' );
}
return $url;
}