You may detect it by one of the following events:
- foreign trades/payments in your Reports which were not performed by you.
- incoming notification emails that were not requested by you.
- foreign sessions and/or unknown activity in the Security log.
If you see any of the above, please follow the steps below immediately:
- Change your password and terminate all sessions here.
- Enable 2-factor authentication, if you haven't already.
- Change the password to your email account.
- Check your computer for malware. Make sure that you are not using a public/unprotected WiFi connection.