Credit for Banner Image
Hi @JohnWolf2,
While we do not have the same built-in attribute functionality that Story Maps has, you can add attribution to row background images through the Text Card. In my example here: https://stop-the-spotted-lanternfly-qa-pre-hub.hubqa.arcgis.com/ I have a Text Card to which I've added an attribution source link. If you add a full-width Text Card, then select "Edit in HTML" you can essentially copy my code below. Feel free to change the color or font-size as you wish. The Bootstrap class "pull-right" right-aligns the text, if you wish to have left-aligned text, just remove the class and it will default to that.
<span style="color: #fff; font-size: 14px;" class="pull-right">Image Source: <a href="https://www.flickr.com/photos/usdagov/30776349158/" style="color: #fff;">USDA</a></span>
If you need to darken or lighten the background of the text to improve contrast over top of your image, you can also add a background-style and some padding to the span tag.
<span style="color: #fff; font-size: 14px; background-color: rgba(0, 0, 0, 0.3); padding: 2px 3px;" class="pull-right">Image Source: <a href="https://www.flickr.com/photos/usdagov/30776349158/" style="color: #fff;">USDA</a></span>
which would give you this affect:
