Thank you Brandon!
Is something like this :
<div id="sp-form-42181" sp-id="42181" sp-hash="71067b2cf13347845405e3d1f98ea59d3e6ec6a928303915aa7d67305796dec0" sp-lang="en" class="sp-form sp-form-regular sp-form-embed" sp-show-options="{}">
<div class="sp-message"> <div></div> </div> <div id="droppableArea" class="sp-element-container ui-sortable ui-droppable" ><div class="sp-field " sp-id="sp-894e104d-b558-4c08-a6ec-e5698e877205" > <div class=" " style="font-family: inherit; line-height: 1.2;">Once a week we send a digest with the most popular articles.</div> </div>
<div class="sp-field " sp-id="sp-35774969-c20f-4bdb-901d-8cb36123c679" >
<label class="sp-control-label "> <span class="">Email</span> <strong class="">*</strong> </label> <input sp-type="email" name="sform[email]" class="sp-form-control " placeholder="[email protected]" sp-tips="%7B%22required%22%3A%22Required%20file%22%2C%22wrong%22%3A%22Wrong%20email%22%7D" required="required" type="email"> </div></div>
<div class="sp-field sp-button-container " sp-id="sp-a5f65550-4592-4bf9-bf17-b76c605499bf" > <button id="sp-a5f65550-4592-4bf9-bf17-b76c605499bf" class="sp-button "> Subscribe </button> </div> <div class="sp-link-wrapper sp-brandname__left" >
<a class="sp-link " target="_blank" href="https://sendpulse.com/en/?ref=66**21">
<span class="sp-link-img"> </span> <span translate="FORM.PROVIDED_BY" class="">Provided by SendPulse</span> </a> </div> </div> <script type="text/javascript" src="//cdn.sendpulse.com/apps/fc3/build/default-handler.js"></script></div>
So, for the “action” part of the form, I am lost… for the fields Email, Name, etc… I think I can use the ID, like sp-35774969-c20f-4bdb-901d-8cb36123c679, because even when you create your own label (like CITY), it will generate this ID.
Thanks a lot for your answer! I am also in contact with SendPulse (very nice support) and when I have a solution I publish here, as it can help other people. =)