For your convenience, the presets list is splitted to categories called Galleries. When you choose a category from the Galleries list, a presets sequence will update displaying all presets included in the current gallery. To select a preset, simply click on a needed frame and you will see the result in the Real-time preview window and Preview Area.
To create a new gallery, press the 'Add new gallery' button. It is in the 'Galleries' panel on the right of the panel name and marked with an icon depicting a '+' sign.
When you click on it, the 'Add gallery' dialog will appear, where you can enter a gallery name, author and description. The 'Name' field is mandatory, you can leave other fields blank. Press 'Ok' to create a new gallery, press 'Cancel' to abort. After confirmation, a new gallery will appear at the end of the galleries list. Now you can select it with a click and add new presets to this gallery.