At the top right of PiBakery, along with the Write button, there is also two other buttons: Export and Import.
Once you have set the configuration using the blocks that you want, click on the Export button.
This will ask you to choose a save location for your setup file. Save it anywhere you want. This file can then be shared with others and imported back into PiBakery to allow other people to use your configuration to setup their Raspberry Pi.