First, ask the future wallet co-signers to share their signer key with you. Here is how they can do it:
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Make sure you are using the latest version of Argent X. Argent X is available as an extension on the Chrome Web Store, Microsoft Edge Add-ons, and Firefox Add-ons.
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Open Argent X and go to the accounts list
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Click + and select Multisig account > Join existing multisig
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Copy your pubkey (it does not grant access to your Argent X wallet, so it is safe to share with your co-signers) and send it to the account creator
Once the account creator has collected the pubkeys, they can create a new multisig and add these keys as co-signers.
After the multisig account is created, you will need to activate (deploy) the account onchain before you can use it for transactions.