Remove "My Memberships" actions with WooCommerce Memberships

wc-memberships-remove-action.php

<?php
/**
 * Only copy the opening php tag if needed
 */
function sv_edit_my_memberships_actions( $actions ) {
	// remove the "Cancel" action for members
	unset( $actions['cancel'] );
	return $actions;
}
add_filter( 'wc_memberships_members_area_my-memberships_actions', 'sv_edit_my_memberships_actions' );
add_filter( 'wc_memberships_members_area_my-membership-details_actions', 'sv_edit_my_memberships_actions' );

Where do you place this code (or php file) to make it work?

How to programatically cancel the membership?

For example I have two memberships one for trial and another for upgrade. If user upgrade the then automatically the trial memberships will be cancelled.