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You must be referring to http://www.pixtas.com/faq.html which is an iphone app. Please correct me if this is not the Pixtas app you were referring to.
I did a bit of research, and it seems there is no html tag or widget to allow the form to be embedded on this app.
I will search more if there is a means to embed a form to Pixtas app.
I will update you of the results here when I have.