There are two ways to embed Adventrs on Wordpress sites. 

The Best Way

Add a Custom HTML block and paste your Adventr's responsive embed code into the html area. 

The easier (but feature-limited) way

You can add an Embed block and paste the Adventr's public URL (not the embed code) to your Adventr. It will automatically expand into an embedded video:

However, if you use Wordpress's standard Embed block, Wordpress may disable features like fullscreen, sharing and external links.