Once you have finished building your quests use the "Generate File!" button and copy the output into a quests.qw file located in your saves folder
If you want the default category for a connector or quest type "intro", if you want a quest or connector to not require another quest type "nil" (without the " for both!)
Known bugs: make sure you generate all your categories and quests before you start putting them on the grid, currently doing this before will result in grids being reloaded