You can link an account to an existing account in the Client Area under the Attached Accounts section.
Please note that all personal account data (except for the email address and a phone number) must fully match in all the accounts. This includes your full name, date of birth, address, and zip code.
After adding an account to an existing one, you will be able to quickly switch between the Client Areas. All attached accounts automatically receive a single level of verification. The level of verification of new accounts is determined by the highest level of one of the attached accounts. When removing an account from a group of accounts, its verification level is reset to zero.