Remove background from stock image

Hi everyone,

I just bought my first eps from a stock site.

Sadly for me the image came without a transperent background as seen on the preview.

I contacted the suppot of the stock site and they told me I should use Illustator which I've never used before.

After playing around with the diffrent layers of the image I can't get a transparent background.

There should exist the possibility to get it done with image trace, but when I open it I can't select enything. It's all greyed out.

The image looks like this:

The background is not transparent, even when it looks like it. It's just like a jpg.

Opened up in Illustrator when I deselect the diffrent layers it looks like this:

Any advice what I should do?

Thanks