Hi all,

looking for solution how I can pass default values to a form field from specific URL. I have situation where visitor can click a product link that redirects to contact form. I would like to pass value via link to a field on that form, so he/she don't have to enter this choice again. 

I was trying something like this:

http://example.com/contactus?=

but that does not work. Any ideas how to solve that?