If needed, carefully open your bracelet, by very gently but firmly pulling the two ends apart, so that it fits over your wrist from the side.
Place the open part of the bracelet at the side of the narrowest part of your wrist, moving far enough to be able to turn it into the correct position.
When the bracelet is placed as you want to wear it, gently squeeze it just enough to fit comfortably, and so that it can still be removed by reversing the process.
The next time you put it on, it will fit perfectly without adjustment.