Click the green flag twice to start the game, then click the 'start' button. To generate a name, click the cat. You will be assigned a random Clan and gender. You can also click the green flag once and then click the cat, but this may glitch so it is generally better to click it twice and then click the start button. You may need to click it several times to make the cat appear. The save button adds names to the list. To show the list, press 's'. To hide it, press 'h'.
Thanks to @gadgeteers for the original code and costumes, and @-IcyTea- for the prefixes and suffixes.