If you want to switch to 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 to the left, you can select another account. At the very end of the list, a window with the option to add a new account is displayed.
If you have only one trading account and want to open another one (in a different currency), go to the Client Office, select the My Accounts tab in the left panel and click the "Add Account" button.