Solatul Janazah in Islam simply means prayer for the deceased.
And this is how to observe it

1- After the First Takbeer : Recite Surat Al-Fatiha.

2-After the Second Takbeer: Salat Al-Ibrahimiyya ( Allahumma Salli Alaa Muhammad Wa Alaa Aali Muhammad....to the end ).

3-Ater the Third Takbeer: Pray for the dead but according how its narrated from our Prophet S.A.W. One of them is Allahummagfir lahuu warhamhu wathabbit-hu Alal qawlu Athaabit ).

4- Then lastly after the Fourth Takbeer: Say: ( Allahumma laa tuharrimnaa ajrahuu wa laa taftinna ba'adahuu )
And you should pray for all Muslims.

5- And lastly end the prayer with one Salaam to the right ( Just once)

Jazakallah Hairan. A very timely reminder