I received a text from DEPEDCare about my PDIS Account Reset Password. When I registered my NEAP SIM before, I didn't receive an email from PDIS.
So, I got curious and explore the link given for reset password:

reset password link: www.pdis.deped.gov.ph/password/reset

And this is what I did. And finally, I have now my PDIS Account :)

Hope this will help you also :)