Sign three creation transactions from the owner wallet. This page never asks for a private key.
Do not send any other transaction from this wallet until all three are confirmed. The contracts bake each other's predicted addresses into the constructors, so a nonce used by something else makes the later transactions revert.
Nothing else has to be signed. Defaults are already set: one referral level, 25% direct commission, level-2 share 0, breed fees 20/30/50 SCDO, daily cap 300, market fee 4%. These links are examples inside the hard caps. Opening one in a wallet will ask you to sign it.