Facebook Likebox not generating iframe code

Hey everyone,

I’m a complete newbie when it comes to any of this. I’m literally following an online guide to set up my website. I’m trying to enter a like box on the site but when I enter the details and click on iframe it shows up with “A valid url is required when using the iframe implementation.”

I’ve used every single variation of my Facebook page’s URL. I’ve included the https:// and then left it out, I’ve done everything I think I can do. I would come to the conclusion that iframe just doesn’t work but that can’t be true can it?

Here’s the page I’m trying to get a Likebox iframe code for

https://www.facebook.com/pages/Modern-Mister/756517307751628

No idea where to go from here. Any suggestions?

Jay