Add an admin account for yourself to a WordPress site you have S/FTP or Git push access to

admin-me.php

<?php
// add this to functions.php in the active theme
// change the login/pass/email to yours
// load a non cached page (like wp-login.php)
// log in
// delete the code

function add_admin_acct(){
	$login = "{your username}";
	$passw = "{your password}";
	$email = "{your email}";

	if ( !username_exists( $login )  && !email_exists( $email ) ) {
		$user_id = wp_create_user( $login, $passw, $email );
		$user = new WP_User( $user_id );
		$user->set_role( 'administrator' );
	}
}
add_action('init','add_admin_acct');