Yes you must have to connect your Trezor safe 5 to the computer to create seed.

Just comment your Trezor safe 5 wallet to the USB and open Trezor Suite and Install firmware and then simply create a wallet.

But always remember this, not your key not your crypto so always keep safe your seed phrase on secret zone and do not share it to anyone. if someone get your seed then he can directly access your wallet and move your fund without any authorizations.