Focus an iframe on page load

I need some help with a client’s website.

In one page, there is a small experience inside of an iframe.
The problem is the iframe is not focused after page loads, you need to click on it in order to type. It is supposed to work without clicking on it. The original experience does that and you can type once it loads.

I think this can be done by JS but I don’t have knowledge to do it.

I’d appreciate any help on this :clap:

Here is my site Read-Only:

And this is how the actual experience work: