Hello, DariuszCebula .
You can try to find your previous email using “Forgot password?” option on the login page. – https://ruhavik.gurtam.space/auth/login
The idea is that you can fill the form with possible email, and if there is any account with such email, the system will send letter with password restoration. If there is no such account, the form will answer that account with such email doesn’t exist. So, you can sort through the accounts and perhaps find your previous account.
If you still can’t find the account, but you want to remove the unit from this account, write to us at firstname.lastname@example.org, we can offer a method to release the ID from the system.