We’ve had this question come up a few times. frevvo forms only support top-aligned labels i.e. the label must be placed above the form field rather than to the left. Why is this? It’s a question of usability. Without any eye-tracking study (and many have been performed), the picture below should make it obvious.
Your users have less to do (fewer eye fixations) to fill out the top-aligned form and studies have confirmed that it takes people less time to fill out top-aligned forms with fewer errors and higher completion rates.
If you really, really want you can create forms with left/right-aligned labels via a custom theme. But, you’ll end up with more usable forms if you just leave the labels where frevvo places them.