EB Project Editor

When you open the EB Project Editor (you can do this from CoilSnake's menu bar), you should see this:

If stuff's greyed out, you probably need to open your project file. Click on the Open Project button, navigate to the folder all your project files are, and click on the "Project.snake" file. When you close EB Project Editor and open it again later, it'll automatically open the last project you were working on. (This can be enabled or disabled in the Options menu.)

Once it's ready, you can click on Tile Editor, Door Editor, or Map Editor.