It is very fast paced and can be a little glitchy, so click the flag a few times. At the beginning don't type __Clan or __star or you will end up with LeafClanClan and Willowstarstar, for example. If it asks you if a clan has any kits/apprentices and it doesn't then type no or just type nothing. When it asks you for the number of a cat it is talking about the little number on the left hand side of each cat.
Thanks to @PenTagon468 for the original! Background from Google
