When you say several fund accounts, you should refer to the fund TA account. Only one fund account can be opened in China Merchants Bank, but you need to open different fund TA accounts to buy funds in different fund companies.

In China Merchants Bank online banking, you should be able to modify it yourself, just open China Merchants Bank online banking. The fund account number and password used when logging in to the fund company website need to be registered first, and the fund company will prompt you. You can check first.