Pending certificates cannot be deleted (anymore). The order is already sent to GoGetSSL, and things become a mess if we delete the corresponding record on our end. After 30 days, GoGetSSL will mark the order as failed.
Similar story for failed orders: the orders exist with their providers and we can’t undo them.
Over time, the failed and expired orders will move to the bottom of the list, and eventually onto other pages. And if you’re having trouble finding other orders now, you can click the status filter buttons at the top to only view issued certificates, for example.