While the specific method can vary depending on the specific mod (e.g., FIFA 16 Mod FIFA 23), the general workflow for editing the database is as follows:

Here is a deep dive into what the is, how it works, and why it remains the backbone of the game's modding scene. What is the FIFA 16 Mobile DB Editor?

Here's a step-by-step overview of how the DB Editor works:

Advanced users use the editor to add missing teams or entirely new leagues that weren't included in the original 2015 release.