To be attached to your IB account, the Partner can either register an Affiliate account using your referral link or connect their existing IB account to yours in the account settings.
Attention! Please be noted that in some cases, attachment to Partner A isn't possible. For further information, refer to this article.
As a Partner, you can find your Partner's ID to refer other Affiliates right on your dashboard:
For more information, please check our article "I want to attach my account to a Partner."