Engage HTML File to Wordpress Site

Good Morning,

I want to incorporate my Articulate Engage interaction into my Wordpress site (www.protectmydairy.com) using only the HTML file in my theme's custom HTML section.

  I'm currently using a plug-in created by a member of the E-Learning Heroes group to display my interaction, but the plug-in unfortunately disables my theme's picture slider for some reason.  The plug-in does work and uses an I-frame or lightbox to display the interaction, but, in order to use it, I have to adjust my theme's php as I cannot  change the output viewing size of the interaction (I did see the method whereby I could change the sizing on the HTML file itself, but the plugin requires me to upload the .zip file and I do not know which file in the .zip to modify). If I can adjust a file in the .zip export, please let me know which file needs to be changed for sizing.

If it's possible, I'd rather copy the interaction's HTML file contents into my theme's built-in custom HTML section on my page, but I cannot seem to get that to work either (maybe not calling correct content folder?)  I can call the HTML page as a link, but that's not really helpful.   I do not have enough coding mastery to create my own site, thus I'm using wordpress.  I do not know if what I'm attempting is even possible, but please let me know. 

My Sincerest Thanks!

Lou