Should be fairly self explaining but due to some requests here a step by step guide:

- After installing the mod restart the game.
- Start a new game or load a savegame
- look for the white square button on the right side of the menu bar at the bottom of the screen
- click on it to open the menu with all the extra buildings the mod has on offer.
- select one of them and place them on the map and wait until your settlers have built them.
- depending on the selected building choose what resources should be produced on the building's pop-up menu.