How do you fill the address fields ?

You can get address field names by "Inspecting" elements inside of the browser, link is is shown inside of that guide. 

Here is a sample code for form with Address field: 

http://form.jotformpro.com/form/61967144918972?address[addr_line1]=Street%20address&address[addr_line2]=Street%20address%202&address[city]=city%20&address[state]=state&address[postal]=12300&address[country]=United%20States 

Yellow parts are filed names of Address field. 

You can also prepopulate your form with prepopulate app: http://prepopulate.jotform.io/ 

Hope this will help. Let us know if you need further assistance.