Example of how to add links to the Member Links list on the Membership Account page.

my_pmpro_member_links.php

<?php
/**
 * Example of how to add links to the Member Links list on the Membership Account page.
 *
 */

// Add links to the top of the list
function my_pmpro_member_links_top() {
	//Add the level IDs here
	if ( pmpro_hasMembershipLevel( array(1,2,3 ) ) ) {
		//Add the links in <li> format here ?>
		<li><a href="/top/">My Member Link Top</a></li>
		<?php
	}
}
add_filter( 'pmpro_member_links_top','my_pmpro_member_links_top' );

// Add links to the bottom of the list
function my_pmpro_member_links_bottom() {
	//Add the level IDs here
	if ( pmpro_hasMembershipLevel( array( 1,2,3 ) ) ) {
		//Add the links in <li> format here ?>
		<li><a href="/bottom/">My Member Link Bottom</a></li>
		<?php
	}
}
add_filter( 'pmpro_member_links_bottom','my_pmpro_member_links_bottom' );

An updated version of this code is available here: https://github.com/strangerstudios/pmpro-snippets-library/blob/dev/frontend-pages/add-members-links-to-members-account-page.php