It is perfectly okay to break the fourth wall. I am not familiar with the example you're referring to, but I can try to give a few tips:
1- The storyteller. These usually address the reader directly like, well, a storyteller.
2- The crazy narrator who has no idea the fourth wall even exists and directly addresses the reader at every opportunity.
3- The lean. This is when the characters don't really address the reader directly, but more acknowledge they're in a work of fiction.
I have seen all forms done well. The main thing to keep in mind is consistency, because pulling out a sudden fourth wall break can be really jarring. Leaning can be done without much of a prerequisite, because it is just a lean that can be more easily worked into a piece compared to a full on break.
TV Tropes has more information on this, along with a ton of examples, but I hesitate linking you to that site because it is highly addictive.
A writer is a world trapped in a person— Victor Hugo
Ink is blood. Paper is bandages. The wounded press books to their heart to know they're not alone.
