Account
From the app:
Click on [Menu] > [My account] > "Account settings" icon [⚙️] > [Password]. In ‘Old password’, enter the last password you used to log in, then choose a new password, confirm it and click on the [Confirm] button.
From the website:
Click on your username in the top right-hand corner > [My settings] > [Change your password]: Choose your new password, confirm it and click on the [OK] button.