Simply copy the image and credit the owner: cjsofy.com wherever you use it.
How you copy depends on what device you are using to view this site. On a computer you would normally right-click the image and see what options you get. On a touch device the copy option usually appears when touch-hold on the image.
I'm Chris Jones and I took these photos and I am the owner of the image.
The original image is much bigger so ask me if you want a bigger one.
If you would like me to resample/rescale the original and sharpen it for any particular width for your website just let me know and I'll happily do that and email it to you.
The licence for the image you saw is Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
That requires that you give some credit to the work of the originator of the image with a link which can be a little mention tucked away at the bottom of your copy of the image.
The owner of the image is cjsofy.com and the destination (URL) is https://cjsofy.com and you can say something like "Photo: cjsofy.com" near the image such as part or your image caption.
My email is at the top of this page (remove the spaces). You can tweet or DM me on https://twitter.com/cjsofy2