You can do this from your Photos app or from the preview square in the Camera app. This is located in the upper-right corner. This will open the image editing options. This is located along the bottom of the image, and has an icon of an eye with a line through it. The iPad will only correct the red eye if it detects it. Tapping on other parts of the image will have no effect. If you aren't happy with the changes, tap the eye again to undo it. If you are happy with the changes to the red eyes, tap the "Apply" button in the upper-right corner of the screen. If you can't get the red eye to go away effectively, you may need to use a more powerful image editing program.

TL;DR in Indonesian:
Bukalah gambar yang ingin Anda hilangkan mata merah di dalamnya. Ketuk "Edit". Ketuk tombol "Red Eye". Ketuk setiap mata merah yang terdapat di dalam gambar. Simpan perubahan yang sudah dilakukan.