Where can I find the embedded subscribe form?

You can find the form by logging in to Laposta and going to the page Subscribers (click on the relevant list) → Enrich → Subscribe. Click 'Start' under the heading 'Embedded subscribe form'.

How do I place the form?

To place the form it is sufficient to include a single line of javascript in your website. You will find this javascript line right after clicking 'Start' (or after configuring your form).

(Temporarily) not showing the form

If you do not want to show the form, you do not need to remove the javascript code. Click 'Stop showing the form' on the primary page of the form and click 'Make form visible again' to show the form again.

Put changes live

If the form is already on your website and you want to edit it, it would be inconvenient for your visitors to see the changes as they are happening. For that reason, the current version is kept, until you click 'Put changes live'.

WordPress

There is a convenient plugin available for WordPress. You then do not have to put any javascript. Moreover, the plugin provides a shortcode for displaying the form on specific pages.

You can find the plugin here.

I receive an error notification 'list_id not found'. What now?

It is important that the shortcode is actually pasted as a shortcode. In the default WordPress editor, and that of the most themes, there is a special block available for this. Are you putting the shortcode in a regular text block? Then check in the text display (tab: Text' or option 'Edit as HMTL') of your block if the notation is still correct. Sometimes a format code is added to your shortcode, which means that the list_id can no longer be read.