Hi there!
I hope you don't mind me replying in English, since it's the official language in the Community. I’d recommend having a quick scan of the email accounts that you own for emails from ‘hello@spotify.com’. That way you can determine which one you used to sign up for Spotify. I'd also recommend checking out this Support article for more help.
Let me know how it goes!
Hey there you, Yeah, you! 😁 Welcome - we're glad you joined the Spotify Community! While you here, let's have a fun game…