How to change the email address of my P-User account. The field is disabled

I want to update my P-User email address but I see I can't, fields are disabled.

Currently one set is deprecated, and maybe removed or inaccesible.

In openSap is allowed. Why not in Universal / Account / Profile sections? profiles now that a SAP Universal ID is the standard?

As could be seen in screenshots... fields are disabled.

I understand that this need be do by a Partner admin if your account is a S-User but with P-user?? I'm only a student

At account site:

At people site:

It's a bit wreid. I receive duplicated emails, notifications, etc.

Thanks in advance.