Appropriate application forms for the required passport service can be found on the Embassy’s website at: https://it.usembassy.gov/u-s-citizen-services/passports/

If using the online version of the application form, once you have answered all the questions the form will generate as a PDF file. You must print the application form as it cannot be submitted to the Embassy electronically. If you have difficulty with the online application form, there is a downloadable PDF version which can be printed and completed by hand using black ink.