To enable Newsletter Subscribe widget on an article page, you will have to take the following steps based on the platform you are using Vuukle on.
Enable Newsletter Subscribe widget using WordPress plugin:
In your WordPress Admin panel, go into Settings > Vuukle and choose On for Show Newsletter bar option
You can also change the position of the newsletter subscribe widget by altering the Newsletter Bar Position option provided by the plugin.
Enable Newsletter Subscribe widget for Blogger:
[vuukle-subscribe] .Then click the Save button.
In your website’s code, insert the following HTML where you want the Newsletter Subscribe widget to display