When you download a preset.zip file from the community, the installation process is straightforward:

To create a preset in-game:

: You can load presets directly from the character management menu. To delete a preset you no longer want, right-click it in the schedule or preset menu.

The default system can get cluttered if you have many presets. Fortunately, the community has created powerful tools to solve this:

Simply drop your downloaded .preset files into this folder.