Open your dashboard
Kudobox has no password. Your dashboard link is the way in — nothing to forget, nothing to steal in somebody else's breach. The one cost of that is this page: if you lose the link, it has to be sent back to you.
It goes to the address on the account and nowhere else, and this page says the same thing either way — so nobody can use it to find out whether an address has an account here. If the address you used is one you no longer reach, write to support@getkudobox.com and a person will sort it out.