add image to text block of collage

Site URL: https://www.robbieandjennywedding.com/

Hello! I'm trying to add an image into the text block of the collage on the page linked above and here: https://www.robbieandjennywedding.com/

Where the words IMAGE HERE are I would like to place this image: 

Can someone help me with the CSS for this? Thank you!

Do you use Personal or higher plan?

Personal!

If you use Business Plan or higher, we can handle easier.

With Personal Plan, add this to Home > Design > Custom CSS

div#block-a35035913d2fbc226936 .image-subtitle p:first-child {
    background-image: url(https://beaverhero.com/wp-content/uploads/2019/06/trees-3464777_640-min.jpg);
    background-size: cover;
    background-repeat: no-repeat;
    height: 100px;
}
div#block-a35035913d2fbc226936 .image-subtitle p:first-child * {
    color: transparent;
}

Thank, that's mostly working! How do I find/create an appropriate image address to add the image above? I tried sourcing it from this post but it's not formatting correctly and I tried uploading it to a separate page on the site I'm building but couldn't find the image address that way. 

Never mind, I got it. Thank you so much!!!