Force login/register before posting

Hi,
yes it is possible, from wp-admin / Pages panel edit the Create Ad page (the one with [adverts_add] shortcode in the content) and change the shortcode to

[adverts_add requires="read"]

then only users with “read” capability (basically any logged in user) will be able to post Ads in the frontend.

Please see the documentation for more details https://wpadverts.com/documentation/allow-users-to-post-ads-adverts_add/