Can I hide fields on the collection form?

You can hide form fields in your collection form using CSS:

.kudo_phone, .kudo_title, .kudo_description, .kudo_photo_field {display:none;} 

If you're using the Boast-hosted page, within your Boast dashboard, click "Collect Testimonials", and click the edit button next to the collection form you want to edit. Click the "Settings" tab and scroll to the bottom. You can paste the CSS within the "Advanced - Custom CSS Styles" box. 

If you're using the Javascript embed code on a page on your site, you can paste the CSS in your theme, or paste the code in <style> brackets like this:

With either method, be sure to remove any CSS classes you don't want to hide.