Trying to reset password Time Capsule from other mac, without losing files

So I have a Time Capsule with a backup of my old computer which I just sold.

I bought a new one but I didn't want to recover from backup, just install as a new one and recover a few files from my old backup in the Time Capsule.

However, now here on my new Macbook, I remember the internet password, but I seem to have forgotten the password I need to enter the time capsule.

Any ideas how to get inside my Time Capsule without losing my Time Machine backups inside?

Best regards,

-Ban Luca