Print Format for Invoice, delivery note and maintenance visit

I am creating new print format using drag and drop (finally… thank you guys)
How do i add invoice number or delivery note number or maintenance number

video is private?

thank you very much {{}} was all i was missing
i have another question my system is in english but i would like to create a template in french for my french speaking clients, how can i change the labels like Customer, Due Date, Contact, Mode Of Payment ETC