How do I fix my rear lights ?? I’ve changed bulbs and idk if it’s a fuse or not

If you know you've replaced bulbs with the proper application bulbs -- and it's really important to ensure you have the correct bulbs, because incorrect bulbs will not work. If you're saying the parking lights aren't working but the brake lights are, it just sounds like incorrect bulbs. Otherwise, further testing is required in the electrical circuit. www.repairpal.com/repair-shops