There are a few things that you need to take into account when syncing your trigger and flash. The first is the speed of your shutter. Your shutter needs to be fast enough to allow the light from the flash to reach the sensor. If your shutter is too slow, then you will get a blurry image. The second thing to consider is the distance between your subject and your flash. The further away your subject is, the longer it will take for the light from the flash to reach them. This means that you will need to use a slower shutter speed or increase the power of your flash. Finally, you need to make sure that your trigger and flash are both in sync with each other. You can do this by using a sync cable or by setting them up so they are both on the same wireless channel.