Under the active contract, you can have a total of 4 real accounts and 5 demo accounts in different currencies.
To open an additional account, go to the Client Office, click My Accounts at the left-hand panel, then select the appropriate tab (Real accounts / Demo accounts) and click on the "Add account" button in the upper right corner.
If you want to open another account in the mobile application, click on the balance value at the top of the screen. After that, windows with all existing trading accounts will be displayed. By swiping left to the very end of the list, you will see an option to add a new account.