Q: how to disable my icloud account?

Hello, gabriel3j2015. 

Thank you for visiting Apple Support Communities.  

I would need clarification on this question to provide a better answer.  However, if you need to reset your iCloud password, see the steps in the first article below.  If you have changed your Apple ID and asked for your old password, see the second article below.  

If you forgot your Apple ID password

If you're asked for the password to your previous Apple ID when signing out of iCloud

-Jason H.