changing the internal password

[Beatriz Mart�nez Jim�nez]

Hello, I am trying to log in the sqlplus (from command line) as the
internal user but I can�t remember its password.
Is there any way to change it?
TIA

begin:vcard 
n:Jimenez;Beatriz Martinez
x-mozilla-html:FALSE
org:Fundaci�n CIDAUT;Departamento de Inform�tica
adr:;;Parque Tecnol�gico de Boecillo p.209;Boecillo;Valladolid;47151;Spain
version:2.1
email;internet:[EMAIL PROTECTED]
title:Ingeniera Inform�tica
fn:Beatriz Mart�nez Jim�nez
end:vcard