Follow my blog post - link author name to vendor shop page url in frontend submission

link-author-name-to-vendor-shop-page.php

<?php
// add filter to change vendor author name/url
add_filter( 'wpw_fp_change_author_name', 'vendor_author_url', 10, 2 );

function vendor_author_url( $author_name, $author_id ) {
    	
    	// get user
 	$user = new WP_User( $author_id ); 
 	
 	// get vendor store url
 	$vendor_url = EDD_FES()->vendors->get_vendor_store_url( $user );
   
 	$html = '<a href="' . esc_url( $vendor_url ) . '">' . $author_name . '</a>';
    
    	return $html;      
}
?>