how to un constrain a rigidbody unity code example

Example 1: rigidbody2d unfreeze position

public Rigidbody2D rb;

void Start()
{
	rb.constraints = RigidbodyConstraints2D.None;
}

Example 2: unity rigidbody constraints unfreeze

rb.constraints = RigidbodyConstraints.FreezePositionX | ~RigidbodyConstraints.FreezePositionY | RigidbodyConstraints.FreezePositionZ;