You need to install a WordPress newsletter plugin.
First, log in to your WordPress website as an admin. Head to Plugins and click on Add New.
Search for “Sendinblue”, then install the plugin “Sendinblue Subscribe Form and WP SMTP”.
Collect more email subscriptions via Popupsmart’s attention-grabbing subscription popups.
Moreover, Popupsmart can flawlessly integrate with both Sendinblue and WordPress!