Here’s the way I resolved the embedded image. Right click on the image and select properties, that drop down menu will show you the file path to the location of the image file which is named “security-lock.jpg”.
Login to your hosting services cPanel, go to files, trace the path you obtained in the above, it will pretty lengthy, mine was something like “https://music.capeaudio.com/wp-content/themes/redline/library/media/images/security-lock.jpg”. That is where the actual image is invoked.
The security-lock.jpg file dimension, on my installation, was 380px x 253 px. I used photoshop to resize an image I preferred to use to that size, named it security-lock.jpg and uploaded to the directory, via cPanel, the original file was over-written and the image was updated with that image I preferred.
The other thing you will have to edit for that field is the word in the header, “Picture” and the footer that reads “Image is Public Domain from…. “
That editing can be done from the wordpress dashboard under Appearance/Editor, the file to edit is RedLine: sidebar-top.php.
Alternately, it may have just been easier to add the preferred image to the media directory and call it from the images content with a variable.
Maybe the author of the theme will have something to improve on the method… because I know NOTHING about how to write any of these codes!