The ones that say "Blinkers" go into the black sockets. There are 6 of these sockets, so you have an extra LED. All sockets take 555 wedge-base bulbs or LED equivalents. The black slots are just color-coded for 545 bulbs or led equivalents, which are the same as 555 except they have a built-in blinking function.
The 7 "C-Change" I assume are color-changers. They go into white sockets of your preference. They can go either in the 7 sockets at the top so that "Twilight Zone" changes colors on the translite, or they can be placed in the kite-looking constellation of sockets on the right in order to make the door behind Rod Serling change colors.
The rest of the LEDs are simply white 555 replacements and go in the rest of the white sockets.
Remember that you can mix and match bulbs/LEDs to your own taste. Just make sure that any one you use is meant to go in a 555 bulb socket.