How do I access our administrator after employee quits?

Hi,

I am a member of a university, we have a website where we host a law magazine.

The employee that was in charge of uploading or changing information has quit. We have the username and password she gave us but when we login we only see this:


INICIO USUARIO
Administrador web
REVISTA DE DERECHO
Gestor/a de revistas

Editor/a 5 Sin asignar 0 En revisión 1 En edición [Crear número] [Notificar usuarias/os]

Autor/a 6 Activo 7 Archivo [Nuevo envío]
MI CUENTA
Editar Mi Perfil
Cambiar mi clave
Salir


where do we modify the contents?
How can we modify the template of the website?

Thanks,
Francisco

Where exactly do you login? What software are you using (OJS, OMP?) and what version?