1. Download the Reggie level editor from the official website.
2. Install the Reggie level editor.
3. Open the Reggie level editor.
4. Click on the "New" button to create a new level.
5. Select the desired tile set from the "Tileset" drop-down menu.
6. Use the mouse to place tiles on the grid.
7. Click on the "Play" button to test your level.
8. Click on the "Save" button to save your level.
Here are some additional tips for using the Reggie level editor:
* Use the scroll bars on the right and bottom of the screen to move around the level.
* Use the zoom slider on the top-right of the screen to zoom in and out of the level.
* Hold down the "Shift" key to move the tiles more quickly.
* Press the "Esc" key to cancel an operation.
* Press the "F1" key to open the help screen.