or simply these URLs:
Disable URL : http://<pihole ip address or hostname>/admin/api.php?disable&auth=[your pihole password]
Enable URL : http://<pihole ip address or hostname>/admin/api.php?enable&auth=[your pihole password]
Disable for [X] Seconds: http://<pihole ip address or hostname>/admin/api.php?disable=[X]&auth=[your pihole password]