Make sure you've quit out of tkMOO.
Right-click on the following link: worlds.tkm.
Save the file into the tkMOO installation directory (probably called tm-0-3-25s or something like that), replacing the worlds.tkm that's already there. If you're using Internet Explorer, it may want to save the file as Text; if that's true, choose "All Files" in the "Save As" box and click on the existing worlds.tkm. If it doesn't ask you if you want to replace the file, something has gone wrong.
Start tkmoo.
If you're interested, I've got a more radical worlds.tkm that's a bit more like my default font/color/etc configuration.
Jay Carlson (nop@nop.com)