My account settings can be found under top navigation bar's person icon. In my account form the user can change their email address, phone number, language and the password. The password change via My account form works directly for Mobile login.
From the My account form the user can open the Purchase Invoices' personal settings in a new tab.
Note! The saved settings are instantly saved to the database. The form anyhow has a lag in showing the updated settings in case the form is refreshed straight after the saved changes. This may feel confusing but the saved changes have been successful despite of this lag on the form.