Why is my iframe code not working?

I have two codes for two different pages I'm trying, but neither of them are showing. I have tried logging out as admin (because I saw that was an issue for others) but it still is showing up blank on both pages.

Another admin tried on his computer and it showed him the attached message.

@natalierenae1007

The link you are using in iframe must be starting from

http://

and squarespace blocks content coming from the link that starts with

http://

due to security. it only allows links with

https://