Trying to get button to change Mixcloud widget URL

Hey guys wondering if anyone could help, I am very new to web development and me and a friend have made a website on wix for a radio station we’re starting. We’re trying to get a Mixcloud widget at the bottom of the page so users can listen to old shows. We’ve just about ,managed that following the Mixcloud instructions and putting this into our wix site in the custom code section in settings:

But the last step is we want this to update when people click on a different show. I’m trying to create a widget to do this following these instructions:

If you would like buttons on your website that load in new content in to the widget you can include an attribute on an element:

Click me to play my other upload!
Clicking the element will now load new content into the player. See below for more advanced usage.

But this doesn’t seem to work been trying to figure out a way to do it but just can’t! Any help would be much appreciated and if it’s quite a complex problem to solve we may need to get someone in as you can probably tell we’re not the best at this stuff!

Cheers,

Jamie