Here's how it works:
* You introduce something: "The team had two main challenges. Firstly, they needed more funding. Secondly, they needed to improve communication."
* You refer back to it: "The aforementioned funding issue was addressed by securing a grant."
In the example, "aforementioned" refers to the previously mentioned "funding issue".
Other ways to say "aforementioned":
* Previously mentioned
* Earlier stated
* Above-mentioned
* Said earlier
Example:
* "The car is blue and has four doors. The aforementioned car is parked in the driveway."