Sorry, I misunderstood the question the first time I read it. I though you where asking how to get the Checkbox to the left of the pager, not the left of the label.
The Form builder interface doesn't allow you to place the labels to the right of the elements.
You will need to rearrange the label and form divs after the form has been created.
If you edit the form using the form builder interface later, the c changes will lost.