I have AirPods but one is fixed can I change it?

You can indeed purchase a replacement for your broken one, go here > AirPods Repair - Official Apple Support

Hello!

From the picture I see, I believe that is an AirPod Pro. As far as I know, (I may be wrong) you can only buy a single AirPods for normal AirPods, not the Pro version.

Hopefully this helped

MrAwesomeness