Thanks, Ihor and Max!
It's working.
I was stuck first with emacs (trying to find org-protcol.el code 8). And 
then I was stuck with Windows.
Next thing I would like to do is to capture fragments of websites, and 
to save them automatically with this format:
* Author. Data. /Title/. Website.
Link
Captured text
I think org-remark could do it ¿?
Best regards
Date: Sat, 24 Jun 2023 10:21:47 +0000 From: Ihor Radchenko 
<yantar92@posteo.net> To: Ypo <ypuntot@gmail.com> Cc: Org-mode 
<emacs-orgmode@gnu.org> Subject: Re: How to install org-protocol 
Message-ID: <87352h88jo.fsf@localhost> Content-Type: text/plain Ypo 
<ypuntot@gmail.com> writes:

> I would like to give another try to org-protocol, but I can't find the
> package to install it. Is it on org-contrib? A link, please?

It is built-in.

El 24/06/2023 a las 18:00, emacs-orgmode-request@gnu.org escribió:
> Message: 6
> Date: Sat, 24 Jun 2023 17:46:33 +0700
> From: Max Nikulin<manikulin@gmail.com>
> To:emacs-orgmode@gnu.org
> Subject: Re: How to install org-protocol
> Message-ID:<u76hia$16rm$1@ciao.gmane.io>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> On 24/06/2023 16:06, Ypo wrote:
>> I would like to give another try to org-protocol, but I can't find the
>> package to install it. Is it on org-contrib? A link, please?
> Have you stuck with emacs or with desktop handler configuration?
>
> In emacs init file you should have
>
>        (require 'org-protocol)
>
> *after*  modification of `load-path' if you use non built-in Org version.
> You need running server: either emacs should be started as a daemon or
>
>        (server-start)
>
> I have never tried to configure org-protocol on Windows, so I have no
> idea if recipes are correct.
>
> https://orgmode.org/worg/org-contrib/org-protocol.html
> https://github.com/sprig/org-capture-extension/#under-windows