How can I change my Apple ID w/o my password?

If you forgot your Apple ID password - https://support.apple.com/HT201487

If you still need help:Contact Apple for help with Apple ID account security "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues." https://support.apple.com/HT204169

See if anything here helps.

Apple ID – Forgot Password

If necessary, contact Apple ID Support.

Apple ID Support

Apple ID Support (2) 

Apple Support by e-mail or chat    Work through the screens to get a chat option.  You may need to pick a problem that is slightly different than yours to get a chat option.  

Apple Support using Twitter

Or fill out and submit this form.          The form is for iTunes, but it will get passed to the ID Support section.  

The second support link in an earlier post is one I already provided (in case you are not keeping track).

Here's even more! -->

Contact Apple for support and service - "See a list of Apple phone numbers around the world." - https://support.apple.com/HT201232

Contact Support

I think the only thing omitted so far is smoke signals. :-|