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As a b2b debtor, a special account is required to interact as partner. If you don't have an active debtor account you can create a new one by filling out the registration form. This account is the administrator for all data.
After you have submitted the registration form the shop owner has to activate your account. Furthermore he has to flag your new b2b account as a debtor account to grant you all necessary privileges.
After activating a customer as debtor or sales representative these customers can be filtered in the backend of Shopware 5.3.0 and newer.
After your account was activated you can login to your account directly from the frontend account page.