Hi Ntsiuoa,

Take a look a the following Kwiziq lesson on what the plus que parfait is and at the bottom are also links to different verbs showing you how to conjugate them in the said tense.

https://progress.lawlessfrench.com/revision/glossary/verb-tense-mood/the-french-pluperfect-le-plus-que-parfait#:~:text=The%20plus%2Dque%2Dparfait%20is,the%20past%20of%20the%20past.%22

It is the equivalent of the pluperfect in English and used in the same way.

I hope this helps!