Entering shortcode within the tagdiv builder

https://westernlivestockjournaltest.wpcomstaging.com/

I am trying to embed a form to sign up for newsletters from WPForms into our main page using the [wpforms id=”900″] shortcode, but I don’t see an option for entering shortcode in the tagdiv composer. So I switched to just entering it in the classic editor, but as soon as I make an update to the page using the tagdiv composer, it eliminates the shortcode. Is there a way to either enter shortcode in the tagdiv composer or make it so that it stops deleting the shortcode from the classic editor as soon as I switch back to tagdiv composer? Thanks!