Verb conjugation of "chain" in English

It would be an advantage if you could send it via DHL, UPS or another Currier, because the parcel was lost once when we sent it with regular mail. Please send me a reference number after you send it.
Sorry if I did not write back, I was in Napoli during the holidays, then back at work, once again I have so much to do at the weekend, but I will do my best. Greetings from Italy. Marco.
I live in Cataluna in eastern Spain. I have learned in a language school in Berlin but unfortunately only for a short time. I am a waitress by profession and looking for a new job in my village.