register post type for metabox show

Hello,
I’m using your plugin by the way is very good, but from what I saw, you did not registered the type of post and it inserts the metaboxes in all posts of wordpress.

you think or already made ​​some fix for this?
so the METABOX will only appear when the pages of your plugin and not at all.

with this plugin would be quite interesting.

thanks and congratulations for the plugin

https://wordpress.org/plugins/cars-seller-auto-classifieds-script/