Once the passive stem is formed, the 14 conjugation endings follow the same pattern you learned in the active past.
PassiveActive
فُعِلَفَعَلَ
فُعِلَافَعَلَا
فُعِلُوافَعَلُوا
فُعِلْتُمْفَعَلْتُمْ
فُعِلْنَافَعَلْنَا
Shortcut: learn the passive stem, then reuse the familiar person endings.