In each person's profile, in Personas (People). What the donor writes in the form, or what your team fills in by hand, is saved in their profile. Labels are shown as they appear in the Spanish version of the console.
Fields are filled in:
when the person completes a form that has the field;
when your team creates a person with "Crear persona" (Create person) or edits one, in the InformaciĂłn Personalizada (Custom information) section.