Only one Rak'at with the Imam in the Salah of Maghrib

Question:

I got only one Rak'at with the Imam in the Salah of Maghrib. How must I replace my Salah?

Answer:

When the Imam makes the second Salaam, stand up to replace your missed Rak'at. Recite Surah Fatihah and a Surah, perform Ruk'u', Sajdah and then sit down to perform At-Tahiyyaat and then stand again. This time also recite Surah Fatihah and a Surah. Perform Ruk'u', Sajdah and sit down to perform At-Tahiyyaat. Read At-Tahiyyaat, Durud Ibrahim, Dua, and complete your Salah.

[English version of "Ene seul rakaat dans namaz maghrib avec Imam" – Al Jamiat – Vol.4 No.3]