Embedding Problem with basic code and personal plan (I know nothing about coding)

Site URL: https://www.bryanwilsonmusic.com/nft

I am trying to embed this page: https://opensea.io/collection/boomdice-higherground

To my Squarespace page here: https://www.bryanwilsonmusic.com/nft

According to the third party website instructions here: https://docs.opensea.io/docs/embeds it seems simple enough for someone without code knowledge. But it displays on my page as non-functional bare bones when I follow that. Also in a tiny box that I can navigate with but I don't know to make it larger. 

The code according to the instructions would be this:

<iframe src='https://opensea.io/collection/boomdice-higherground?embed=true'
        width='100%'
        height='100%'
        frameborder='0'
        allowfullscreen></iframe>

Am I missing something? Do I need to upgrade from a personal plan to a business plan to make this functional? Any help would be great as I have spent about 5 hours on it and Squarespace say they can't help because it is third party "custom code". Thank you.

On 7/27/2021 at 10:53 AM, paul2009 said:

You are trying to add an 'iframe'. Adding iframes to Code Blocks is considered a "Premium feature" and isn't available on the Personal Plan. 

For more information, see Premium features.

Does this apply to a trial site? As in, these features just won't work to even try them out without subscribing to a Business plan?

1 hour ago, PatrickJ said:

Does this apply to a trial site?

Some premium features - such as the ability to use code - are available during a trial. Other premium features - particularly Commerce features and Member Areas - aren't available during a trial.

Completely ridiculous this is a paid feature, when other website builders offer this for free! So much regret in sign up up with squarespace...