Working With Layers
Hex Kit supports dynamic tiles; tiles that contain transparent elements so that they can be layered ontop of one another to make pretty pictures and cool situations. Clicking the plus sign on the layers section of your tool bar will allow you to create and name new layers; give it a name that describes what is going there such as 'coasts' or 'roads' or 'icons.' The minus button will delete the layer you have selected. New layers will always stack on top of one another, but you can range them by clicking the up and down facing arrows on the left edge of the layer section. Each layer (except the base layer) can be renamed and hidden by clicking the cursor icon or eye icon, respectively.
The Tile Selector
At the top of the tile selector are several buttons. From left to right they are the back button and the edit button, followed by two buttons to change the size of the tiles as they appear in the selector. Beneath that is a drop down box where you can select which tile set you are currently working with.
The tiles that appear below those buttons are the tile categories, they represent a broad number of tiles that can be painted. Tile categories that appear to be a stack of tiles have multiple tiles that will be randomly painted when you have that category selected. Some tile categories will have sub categories inside of them. For example, the 'Secret Vale' tiles in the 'Traveling Through Dangerous Scenery' tile set has three levels of tiles. By double clicking the first category the sub categories are opened, and when a sub category is double clicked the single tiles will open.
When working with single tiles in a category, you can hold select a tile, then hold SHIFT and click on another tile to select a range of tiles to paint. Using the paint tool will only paint random tiles from your selected range. Similarly, you can hold CTRL and select tiles to cherry pick your range.
Importing New Tiles
Start by making sure your folders are somewhere they will live fairly permanently. The folder that contains all of the sub folders and single tiles is the folder you will be importing, and the name of that folder will be the name of the tile set. When you're ready to import the folder open Hex Kit, click 'File' and then the 'Import Tiles' option. A menu to select the folder you want to import will appear; find the folder, select it, and click the 'Select Folder' button. You do not need to select individual tiles or the tile category folders, only the main folder.
After selecting your folder the import settings box will appear. Usually you will only need to click save and be done with it; this tool is mainly for illustrators to generate a settings file when creating custom tile sets. All official Hex Kit tiles will appear to hang outside of the edges of the yellow template hex in this tool, but this is intentional. When importing official tiles do not rotate, re-size, or alter the tiles or you will have a bad time making maps.