I figured out the answer to my own question, but I'll put it here for anyone else who is looking to do this.
In the Online Store Dashboard page, go to Website -> Integrations -> Add Custom Header Code -> Add New Code
Add this code:
<!-- Following code will prevent right click on images place is just above closing </body> tag -->
<script>
document.oncontextmenu = function(e){
var target = (typeof e !="undefined")? e.target: event.srcElement
if (target.tagName == "IMG" || (target.tagName == 'A' && target.firstChild.tagName == 'IMG'))
return false
}
</script>
<!-- code to prevent right click ends here -->
And click on "End of Body" where it asks where the code should be placed.
(Note, I didn't write this code, only grabbed it from another Weebly forum, here: https://community.weebly.com/t5/Vote-on-Features/Disable-Right-Click-On-Photos/idi-p/7662# )
Hope that helps someone else looking to protect their images. 😀
