The Moroccan minhag is to say it before Shacharit and Mincha. Also, the Ben Ish Chai says to say part of it on the nights of Rosh Hashanah before the meals.
You can read it in any Sefaradi or “Sfard” siddur. English translations of such siddurim are readily available. It is not a prayer. There are various customs on when to say it.