Narrative Publish and Showit
Narrative Publish works very well Showit and is very easy to set up.
However, due to limitations you will be able to publish via the WordPress plugin, publish manually via code or using the exporting method depending on the plan you're on.
Showit also only allows you to install plugins on certain plans. Below we have listed what you should do depending on your Showit Plan.
Showit Plans and Publishing Options
Showit + Advanced Blog
Showit + Basic Blog