If you need support from Yola please contact us via support@yola.com or make use of our live chat service! We are working on a new approach to community-based support and during this transition period we are not adding any new threads to this forum. Many thanks to everyone who has participated over the years and we look forward to unveiling a new peer-to-peer support system soon!
This is not doable with the Yola Form widget, however, I do encourage you to try out Wufoo which we have a widget for under the 'Forms and Appointments' tab in the sitebuilder.
Give it a try and let us know how it goes for you!