As with other smart contract wallets, a multisig account must be deployed before it can be used for transactions.
First, the account needs to be funded (with ETH or STRK). You can top up your multisig account by clicking Fund on the home page.
Your multisig wallet will be automatically deployed when you make your first outgoing transaction, such as a swap or a simple transfer.
You can also manually activate (deploy) the account by clicking Activate multisig once the account has funds.
Account activation is an onchain transaction. It has a small network fee and can only be initiated by the account creator, not the co-signers. It might take a few minutes to complete onchain.