During the vault creation process, you must set a very strong wallet password. The wallet password is used to confirm outgoing transactions and cannot be changed in the future.
If you lose or forget your wallet password, you lose access to your wallet. To regain access, you need the main key and the backup key.
These keys are generated upon creation of the wallet. We strongly recommend users to write down these keys on paper, alongside the wallet password and to store them in a very safe place.